import {-# SOURCE #-} TcSplice( runQuasiQuoteExpr )
#endif /* GHCI */
-import RnSource ( rnSrcDecls, rnSplice, checkTH )
+import RnSource ( rnSrcDecls )
import RnBinds ( rnLocalBindsAndThen, rnValBindsLHS, rnValBindsRHS,
rnMatchGroup, makeMiniFixityEnv)
import HsSyn
import TcRnMonad
import TcEnv ( thRnBrack )
import RnEnv
-import RnTypes ( rnHsTypeFVs,
+import RnTypes ( rnHsTypeFVs, rnSplice, checkTH,
mkOpFormRn, mkOpAppRn, mkNegAppRn, checkSectionPrec)
import RnPat
import DynFlags ( DynFlag(..) )
import BasicTypes ( FixityDirection(..) )
-import PrelNames ( hasKey, assertIdKey, assertErrorName,
- loopAName, choiceAName, appAName, arrAName, composeAName, firstAName,
- negateName, thenMName, bindMName, failMName, groupWithName )
+import PrelNames
import Name
import NameSet
import RdrName
import LoadIface ( loadInterfaceForName )
import UniqSet
-import List ( nub )
+import Data.List
import Util ( isSingleton )
import ListSetOps ( removeDups )
import Maybes ( expectJust )
import Outputable
import SrcLoc
import FastString
-
-import List ( unzip4 )
import Control.Monad
\end{code}
thenM_ :: Monad a => a b -> a c -> a c
thenM_ = (>>)
-
-returnM :: Monad m => a -> m a
-returnM = return
-
-mappM :: (Monad m) => (a -> m b) -> [a] -> m [b]
-mappM = mapM
-
-checkM :: Monad m => Bool -> m () -> m ()
-checkM = unless
\end{code}
%************************************************************************
rnExprs :: [LHsExpr RdrName] -> RnM ([LHsExpr Name], FreeVars)
rnExprs ls = rnExprs' ls emptyUniqSet
where
- rnExprs' [] acc = returnM ([], acc)
+ rnExprs' [] acc = return ([], acc)
rnExprs' (expr:exprs) acc
= rnLExpr expr `thenM` \ (expr', fvExpr) ->
acc' = acc `plusFV` fvExpr
in
acc' `seq` rnExprs' exprs acc' `thenM` \ (exprs', fvExprs) ->
- returnM (expr':exprs', fvExprs)
+ return (expr':exprs', fvExprs)
\end{code}
Variables. We look up the variable and return the resulting name.
rnExpr (HsIPVar v)
= newIPNameRn v `thenM` \ name ->
- returnM (HsIPVar name, emptyFVs)
+ return (HsIPVar name, emptyFVs)
rnExpr (HsLit lit@(HsString s))
= do {
rnExpr (HsOverLit (mkHsIsString s placeHolderType))
else -- Same as below
rnLit lit `thenM_`
- returnM (HsLit lit, emptyFVs)
+ return (HsLit lit, emptyFVs)
}
rnExpr (HsLit lit)
= rnLit lit `thenM_`
- returnM (HsLit lit, emptyFVs)
+ return (HsLit lit, emptyFVs)
rnExpr (HsOverLit lit)
= rnOverLit lit `thenM` \ (lit', fvs) ->
- returnM (HsOverLit lit', fvs)
+ return (HsOverLit lit', fvs)
rnExpr (HsApp fun arg)
= rnLExpr fun `thenM` \ (fun',fvFun) ->
rnLExpr arg `thenM` \ (arg',fvArg) ->
- returnM (HsApp fun' arg', fvFun `plusFV` fvArg)
+ return (HsApp fun' arg', fvFun `plusFV` fvArg)
rnExpr (OpApp e1 (L op_loc (HsVar op_rdr)) _ e2)
= do { (e1', fv_e1) <- rnLExpr e1
= rnLExpr e `thenM` \ (e', fv_e) ->
lookupSyntaxName negateName `thenM` \ (neg_name, fv_neg) ->
mkNegAppRn e' neg_name `thenM` \ final_e ->
- returnM (final_e, fv_e `plusFV` fv_neg)
+ return (final_e, fv_e `plusFV` fv_neg)
------------------------------------------
-- Template Haskell extensions
rnExpr e@(HsBracket br_body)
= checkTH e "bracket" `thenM_`
rnBracket br_body `thenM` \ (body', fvs_e) ->
- returnM (HsBracket body', fvs_e)
+ return (HsBracket body', fvs_e)
rnExpr (HsSpliceE splice)
= rnSplice splice `thenM` \ (splice', fvs) ->
- returnM (HsSpliceE splice', fvs)
+ return (HsSpliceE splice', fvs)
#ifndef GHCI
rnExpr e@(HsQuasiQuoteE _) = pprPanic "Cant do quasiquotation without GHCi" (ppr e)
= rnQuasiQuote qq `thenM` \ (qq', fvs_qq) ->
runQuasiQuoteExpr qq' `thenM` \ (L _ expr') ->
rnExpr expr' `thenM` \ (expr'', fvs_expr) ->
- returnM (expr'', fvs_qq `plusFV` fvs_expr)
+ return (expr'', fvs_qq `plusFV` fvs_expr)
#endif /* GHCI */
---------------------------------------------
---------------------------------------------
rnExpr (HsCoreAnn ann expr)
= rnLExpr expr `thenM` \ (expr', fvs_expr) ->
- returnM (HsCoreAnn ann expr', fvs_expr)
+ return (HsCoreAnn ann expr', fvs_expr)
rnExpr (HsSCC lbl expr)
= rnLExpr expr `thenM` \ (expr', fvs_expr) ->
- returnM (HsSCC lbl expr', fvs_expr)
+ return (HsSCC lbl expr', fvs_expr)
rnExpr (HsTickPragma info expr)
= rnLExpr expr `thenM` \ (expr', fvs_expr) ->
- returnM (HsTickPragma info expr', fvs_expr)
+ return (HsTickPragma info expr', fvs_expr)
rnExpr (HsLam matches)
= rnMatchGroup LambdaExpr matches `thenM` \ (matches', fvMatch) ->
- returnM (HsLam matches', fvMatch)
+ return (HsLam matches', fvMatch)
rnExpr (HsCase expr matches)
= rnLExpr expr `thenM` \ (new_expr, e_fvs) ->
rnMatchGroup CaseAlt matches `thenM` \ (new_matches, ms_fvs) ->
- returnM (HsCase new_expr new_matches, e_fvs `plusFV` ms_fvs)
+ return (HsCase new_expr new_matches, e_fvs `plusFV` ms_fvs)
rnExpr (HsLet binds expr)
= rnLocalBindsAndThen binds $ \ binds' ->
rnLExpr expr `thenM` \ (expr',fvExpr) ->
- returnM (HsLet binds' expr', fvExpr)
+ return (HsLet binds' expr', fvExpr)
rnExpr (HsDo do_or_lc stmts body _)
= do { ((stmts', body'), fvs) <- rnStmts do_or_lc stmts $
rnExpr (ExplicitList _ exps)
= rnExprs exps `thenM` \ (exps', fvs) ->
- returnM (ExplicitList placeHolderType exps', fvs)
+ return (ExplicitList placeHolderType exps', fvs)
rnExpr (ExplicitPArr _ exps)
= rnExprs exps `thenM` \ (exps', fvs) ->
- returnM (ExplicitPArr placeHolderType exps', fvs)
+ return (ExplicitPArr placeHolderType exps', fvs)
-rnExpr (ExplicitTuple exps boxity)
- = checkTupSize (length exps) `thenM_`
- rnExprs exps `thenM` \ (exps', fvs) ->
- returnM (ExplicitTuple exps' boxity, fvs)
+rnExpr (ExplicitTuple tup_args boxity)
+ = do { checkTupleSection tup_args
+ ; checkTupSize (length tup_args)
+ ; (tup_args', fvs) <- mapAndUnzipM rnTupArg tup_args
+ ; return (ExplicitTuple tup_args' boxity, plusFVs fvs) }
+ where
+ rnTupArg (Present e) = do { (e',fvs) <- rnLExpr e; return (Present e', fvs) }
+ rnTupArg (Missing _) = return (Missing placeHolderType, emptyFVs)
rnExpr (RecordCon con_id _ rbinds)
= do { conname <- lookupLocatedOccRn con_id
- ; (rbinds', fvRbinds) <- rnHsRecFields_Con conname rnLExpr rbinds
+ ; (rbinds', fvRbinds) <- rnHsRecBinds (HsRecFieldCon (unLoc conname)) rbinds
; return (RecordCon conname noPostTcExpr rbinds',
fvRbinds `addOneFV` unLoc conname) }
rnExpr (RecordUpd expr rbinds _ _ _)
= do { (expr', fvExpr) <- rnLExpr expr
- ; (rbinds', fvRbinds) <- rnHsRecFields_Update rnLExpr rbinds
+ ; (rbinds', fvRbinds) <- rnHsRecBinds HsRecFieldUpd rbinds
; return (RecordUpd expr' rbinds' [] [] [],
fvExpr `plusFV` fvRbinds) }
= rnLExpr p `thenM` \ (p', fvP) ->
rnLExpr b1 `thenM` \ (b1', fvB1) ->
rnLExpr b2 `thenM` \ (b2', fvB2) ->
- returnM (HsIf p' b1' b2', plusFVs [fvP, fvB1, fvB2])
+ return (HsIf p' b1' b2', plusFVs [fvP, fvB1, fvB2])
rnExpr (HsType a)
= rnHsTypeFVs doc a `thenM` \ (t, fvT) ->
- returnM (HsType t, fvT)
+ return (HsType t, fvT)
where
doc = text "In a type argument"
rnExpr (ArithSeq _ seq)
= rnArithSeq seq `thenM` \ (new_seq, fvs) ->
- returnM (ArithSeq noPostTcExpr new_seq, fvs)
+ return (ArithSeq noPostTcExpr new_seq, fvs)
rnExpr (PArrSeq _ seq)
= rnArithSeq seq `thenM` \ (new_seq, fvs) ->
- returnM (PArrSeq noPostTcExpr new_seq, fvs)
+ return (PArrSeq noPostTcExpr new_seq, fvs)
\end{code}
These three are pattern syntax appearing in expressions.
\begin{code}
rnExpr (HsProc pat body)
= newArrowScope $
- rnPatsAndThen_LocalRightwards ProcExpr [pat] $ \ [pat'] ->
+ rnPats ProcExpr [pat] $ \ [pat'] ->
rnCmdTop body `thenM` \ (body',fvBody) ->
- returnM (HsProc pat' body', fvBody)
+ return (HsProc pat' body', fvBody)
rnExpr (HsArrApp arrow arg _ ho rtl)
= select_arrow_scope (rnLExpr arrow) `thenM` \ (arrow',fvArrow) ->
rnLExpr arg `thenM` \ (arg',fvArg) ->
- returnM (HsArrApp arrow' arg' placeHolderType ho rtl,
+ return (HsArrApp arrow' arg' placeHolderType ho rtl,
fvArrow `plusFV` fvArg)
where
select_arrow_scope tc = case ho of
lookupFixityRn op_name `thenM` \ fixity ->
mkOpFormRn arg1' op' fixity arg2' `thenM` \ final_e ->
- returnM (final_e,
+ return (final_e,
fv_arg1 `plusFV` fv_op `plusFV` fv_arg2)
rnExpr (HsArrForm op fixity cmds)
= escapeArrowScope (rnLExpr op) `thenM` \ (op',fvOp) ->
rnCmdArgs cmds `thenM` \ (cmds',fvCmds) ->
- returnM (HsArrForm op' fixity cmds', fvOp `plusFV` fvCmds)
+ return (HsArrForm op' fixity cmds', fvOp `plusFV` fvCmds)
rnExpr other = pprPanic "rnExpr: unexpected expression" (ppr other)
-- HsWrap
%************************************************************************
%* *
+ Records
+%* *
+%************************************************************************
+
+\begin{code}
+rnHsRecBinds :: HsRecFieldContext -> HsRecordBinds RdrName
+ -> RnM (HsRecordBinds Name, FreeVars)
+rnHsRecBinds ctxt rec_binds@(HsRecFields { rec_dotdot = dd })
+ = do { (flds, fvs) <- rnHsRecFields1 ctxt HsVar rec_binds
+ ; (flds', fvss) <- mapAndUnzipM rn_field flds
+ ; return (HsRecFields { rec_flds = flds', rec_dotdot = dd },
+ fvs `plusFV` plusFVs fvss) }
+ where
+ rn_field fld = do { (arg', fvs) <- rnLExpr (hsRecFieldArg fld)
+ ; return (fld { hsRecFieldArg = arg' }, fvs) }
+\end{code}
+
+
+%************************************************************************
+%* *
Arrow commands
%* *
%************************************************************************
\begin{code}
rnCmdArgs :: [LHsCmdTop RdrName] -> RnM ([LHsCmdTop Name], FreeVars)
-rnCmdArgs [] = returnM ([], emptyFVs)
+rnCmdArgs [] = return ([], emptyFVs)
rnCmdArgs (arg:args)
= rnCmdTop arg `thenM` \ (arg',fvArg) ->
rnCmdArgs args `thenM` \ (args',fvArgs) ->
- returnM (arg':args', fvArg `plusFV` fvArgs)
+ return (arg':args', fvArg `plusFV` fvArgs)
rnCmdTop :: LHsCmdTop RdrName -> RnM (LHsCmdTop Name, FreeVars)
rnCmdTop = wrapLocFstM rnCmdTop'
-- Generate the rebindable syntax for the monad
lookupSyntaxTable cmd_names `thenM` \ (cmd_names', cmd_fvs) ->
- returnM (HsCmdTop cmd' [] placeHolderType cmd_names',
+ return (HsCmdTop cmd' [] placeHolderType cmd_names',
fvCmd `plusFV` cmd_fvs)
---------------------------------------------------
= BindStmt pat (convertOpFormsLCmd cmd) noSyntaxExpr noSyntaxExpr
convertOpFormsStmt (ExprStmt cmd _ _)
= ExprStmt (convertOpFormsLCmd cmd) noSyntaxExpr placeHolderType
-convertOpFormsStmt (RecStmt stmts lvs rvs es binds)
- = RecStmt (map (fmap convertOpFormsStmt) stmts) lvs rvs es binds
+convertOpFormsStmt stmt@(RecStmt { recS_stmts = stmts })
+ = stmt { recS_stmts = map (fmap convertOpFormsStmt) stmts }
convertOpFormsStmt stmt = stmt
convertOpFormsMatch :: MatchGroup id -> MatchGroup id
methodNamesLStmt = methodNamesStmt . unLoc
methodNamesStmt :: StmtLR Name Name -> FreeVars
-methodNamesStmt (ExprStmt cmd _ _) = methodNamesLCmd cmd
-methodNamesStmt (BindStmt _ cmd _ _) = methodNamesLCmd cmd
-methodNamesStmt (RecStmt stmts _ _ _ _)
- = methodNamesStmts stmts `addOneFV` loopAName
-methodNamesStmt (LetStmt _) = emptyFVs
-methodNamesStmt (ParStmt _) = emptyFVs
-methodNamesStmt (TransformStmt _ _ _) = emptyFVs
-methodNamesStmt (GroupStmt _ _) = emptyFVs
+methodNamesStmt (ExprStmt cmd _ _) = methodNamesLCmd cmd
+methodNamesStmt (BindStmt _ cmd _ _) = methodNamesLCmd cmd
+methodNamesStmt (RecStmt { recS_stmts = stmts }) = methodNamesStmts stmts `addOneFV` loopAName
+methodNamesStmt (LetStmt _) = emptyFVs
+methodNamesStmt (ParStmt _) = emptyFVs
+methodNamesStmt (TransformStmt _ _ _) = emptyFVs
+methodNamesStmt (GroupStmt _ _) = emptyFVs
-- ParStmt, TransformStmt and GroupStmt can't occur in commands, but it's not convenient to error
-- here so we just do what's convenient
\end{code}
rnArithSeq :: ArithSeqInfo RdrName -> RnM (ArithSeqInfo Name, FreeVars)
rnArithSeq (From expr)
= rnLExpr expr `thenM` \ (expr', fvExpr) ->
- returnM (From expr', fvExpr)
+ return (From expr', fvExpr)
rnArithSeq (FromThen expr1 expr2)
= rnLExpr expr1 `thenM` \ (expr1', fvExpr1) ->
rnLExpr expr2 `thenM` \ (expr2', fvExpr2) ->
- returnM (FromThen expr1' expr2', fvExpr1 `plusFV` fvExpr2)
+ return (FromThen expr1' expr2', fvExpr1 `plusFV` fvExpr2)
rnArithSeq (FromTo expr1 expr2)
= rnLExpr expr1 `thenM` \ (expr1', fvExpr1) ->
rnLExpr expr2 `thenM` \ (expr2', fvExpr2) ->
- returnM (FromTo expr1' expr2', fvExpr1 `plusFV` fvExpr2)
+ return (FromTo expr1' expr2', fvExpr1 `plusFV` fvExpr2)
rnArithSeq (FromThenTo expr1 expr2 expr3)
= rnLExpr expr1 `thenM` \ (expr1', fvExpr1) ->
rnLExpr expr2 `thenM` \ (expr2', fvExpr2) ->
rnLExpr expr3 `thenM` \ (expr3', fvExpr3) ->
- returnM (FromThenTo expr1' expr2' expr3',
+ return (FromThenTo expr1' expr2' expr3',
plusFVs [fvExpr1, fvExpr2, fvExpr3])
\end{code}
rnBracket :: HsBracket RdrName -> RnM (HsBracket Name, FreeVars)
rnBracket (VarBr n) = do { name <- lookupOccRn n
; this_mod <- getModule
- ; checkM (nameIsLocalOrFrom this_mod name) $ -- Reason: deprecation checking asumes the
- do { loadInterfaceForName msg name -- home interface is loaded, and this is the
+ ; unless (nameIsLocalOrFrom this_mod name) $ -- Reason: deprecation checking asumes the
+ do { _ <- loadInterfaceForName msg name -- home interface is loaded, and this is the
; return () } -- only way that is going to happen
- ; returnM (VarBr name, unitFV name) }
+ ; return (VarBr name, unitFV name) }
where
msg = ptext (sLit "Need interface for Template Haskell quoted Name")
rnNormalStmts :: HsStmtContext Name -> [LStmt RdrName]
-> RnM (thing, FreeVars)
-> RnM (([LStmt Name], thing), FreeVars)
--- Used for cases *other* than recursive mdo
--- Implements nested scopes
-
rnNormalStmts _ [] thing_inside
= do { (thing, fvs) <- thing_inside
; return (([],thing), fvs) }
-rnNormalStmts ctxt (L loc stmt : stmts) thing_inside
- = do { ((stmt', (stmts', thing)), fvs) <- rnStmt ctxt stmt $
- rnNormalStmts ctxt stmts thing_inside
- ; return (((L loc stmt' : stmts'), thing), fvs) }
+rnNormalStmts ctxt (stmt@(L loc _) : stmts) thing_inside
+ = do { ((stmts1, (stmts2, thing)), fvs)
+ <- setSrcSpan loc $
+ rnStmt ctxt stmt $
+ rnNormalStmts ctxt stmts thing_inside
+ ; return (((stmts1 ++ stmts2), thing), fvs) }
-rnStmt :: HsStmtContext Name -> Stmt RdrName
+rnStmt :: HsStmtContext Name -> LStmt RdrName
-> RnM (thing, FreeVars)
- -> RnM ((Stmt Name, thing), FreeVars)
+ -> RnM (([LStmt Name], thing), FreeVars)
-rnStmt _ (ExprStmt expr _ _) thing_inside
+rnStmt _ (L loc (ExprStmt expr _ _)) thing_inside
= do { (expr', fv_expr) <- rnLExpr expr
; (then_op, fvs1) <- lookupSyntaxName thenMName
; (thing, fvs2) <- thing_inside
- ; return ((ExprStmt expr' then_op placeHolderType, thing),
+ ; return (([L loc (ExprStmt expr' then_op placeHolderType)], thing),
fv_expr `plusFV` fvs1 `plusFV` fvs2) }
-rnStmt ctxt (BindStmt pat expr _ _) thing_inside
+rnStmt ctxt (L loc (BindStmt pat expr _ _)) thing_inside
= do { (expr', fv_expr) <- rnLExpr expr
-- The binders do not scope over the expression
; (bind_op, fvs1) <- lookupSyntaxName bindMName
; (fail_op, fvs2) <- lookupSyntaxName failMName
- ; rnPatsAndThen_LocalRightwards (StmtCtxt ctxt) [pat] $ \ [pat'] -> do
+ ; rnPats (StmtCtxt ctxt) [pat] $ \ [pat'] -> do
{ (thing, fvs3) <- thing_inside
- ; return ((BindStmt pat' expr' bind_op fail_op, thing),
+ ; return (([L loc (BindStmt pat' expr' bind_op fail_op)], thing),
fv_expr `plusFV` fvs1 `plusFV` fvs2 `plusFV` fvs3) }}
-- fv_expr shouldn't really be filtered by the rnPatsAndThen
-- but it does not matter because the names are unique
-rnStmt ctxt (LetStmt binds) thing_inside
+rnStmt ctxt (L loc (LetStmt binds)) thing_inside
= do { checkLetStmt ctxt binds
; rnLocalBindsAndThen binds $ \binds' -> do
{ (thing, fvs) <- thing_inside
- ; return ((LetStmt binds', thing), fvs) } }
+ ; return (([L loc (LetStmt binds')], thing), fvs) } }
-rnStmt ctxt (RecStmt rec_stmts _ _ _ _) thing_inside
+rnStmt ctxt (L _ (RecStmt { recS_stmts = rec_stmts })) thing_inside
= do { checkRecStmt ctxt
- ; rn_rec_stmts_and_then rec_stmts $ \ segs -> do
- { (thing, fvs) <- thing_inside
+
+ -- Step1: Bring all the binders of the mdo into scope
+ -- (Remember that this also removes the binders from the
+ -- finally-returned free-vars.)
+ -- And rename each individual stmt, making a
+ -- singleton segment. At this stage the FwdRefs field
+ -- isn't finished: it's empty for all except a BindStmt
+ -- for which it's the fwd refs within the bind itself
+ -- (This set may not be empty, because we're in a recursive
+ -- context.)
+ ; rn_rec_stmts_and_then rec_stmts $ \ segs -> do
+
+ { (thing, fvs_later) <- thing_inside
+ ; (return_op, fvs1) <- lookupSyntaxName returnMName
+ ; (mfix_op, fvs2) <- lookupSyntaxName mfixName
+ ; (bind_op, fvs3) <- lookupSyntaxName bindMName
; let
+ -- Step 2: Fill in the fwd refs.
+ -- The segments are all singletons, but their fwd-ref
+ -- field mentions all the things used by the segment
+ -- that are bound after their use
segs_w_fwd_refs = addFwdRefs segs
- (ds, us, fs, rec_stmts') = unzip4 segs_w_fwd_refs
- later_vars = nameSetToList (plusFVs ds `intersectNameSet` fvs)
- fwd_vars = nameSetToList (plusFVs fs)
- uses = plusFVs us
- rec_stmt = RecStmt rec_stmts' later_vars fwd_vars [] emptyLHsBinds
- ; return ((rec_stmt, thing), uses `plusFV` fvs) } }
-
-rnStmt ctxt (ParStmt segs) thing_inside
+
+ -- Step 3: Group together the segments to make bigger segments
+ -- Invariant: in the result, no segment uses a variable
+ -- bound in a later segment
+ grouped_segs = glomSegments segs_w_fwd_refs
+
+ -- Step 4: Turn the segments into Stmts
+ -- Use RecStmt when and only when there are fwd refs
+ -- Also gather up the uses from the end towards the
+ -- start, so we can tell the RecStmt which things are
+ -- used 'after' the RecStmt
+ empty_rec_stmt = emptyRecStmt { recS_ret_fn = return_op
+ , recS_mfix_fn = mfix_op
+ , recS_bind_fn = bind_op }
+ (rec_stmts', fvs) = segsToStmts empty_rec_stmt grouped_segs fvs_later
+
+ ; return ((rec_stmts', thing), fvs `plusFV` fvs1 `plusFV` fvs2 `plusFV` fvs3) } }
+
+rnStmt ctxt (L loc (ParStmt segs)) thing_inside
= do { checkParStmt ctxt
; ((segs', thing), fvs) <- rnParallelStmts (ParStmtCtxt ctxt) segs thing_inside
- ; return ((ParStmt segs', thing), fvs) }
+ ; return (([L loc (ParStmt segs')], thing), fvs) }
-rnStmt ctxt (TransformStmt (stmts, _) usingExpr maybeByExpr) thing_inside = do
+rnStmt ctxt (L loc (TransformStmt (stmts, _) usingExpr maybeByExpr)) thing_inside = do
checkTransformStmt ctxt
(usingExpr', fv_usingExpr) <- rnLExpr usingExpr
return ((maybeByExpr', thing), fv_maybeByExpr `plusFV` fv_thing)
- return ((TransformStmt (stmts', binders) usingExpr' maybeByExpr', thing), fv_usingExpr `plusFV` fvs)
+ return (([L loc (TransformStmt (stmts', binders) usingExpr' maybeByExpr')], thing),
+ fv_usingExpr `plusFV` fvs)
where
rnMaybeLExpr Nothing = return (Nothing, emptyFVs)
rnMaybeLExpr (Just expr) = do
(expr', fv_expr) <- rnLExpr expr
return (Just expr', fv_expr)
-rnStmt ctxt (GroupStmt (stmts, _) groupByClause) thing_inside = do
+rnStmt ctxt (L loc (GroupStmt (stmts, _) groupByClause)) thing_inside = do
checkTransformStmt ctxt
-- We must rename the using expression in the context before the transform is begun
return ((groupByClause', usedBinderMap, thing), fv_groupByClause `plusFV` real_fv_thing)
traceRn (text "rnStmt: implicitly rebound these used binders:" <+> ppr usedBinderMap)
- return ((GroupStmt (stmts', usedBinderMap) groupByClause', thing), fvs)
+ return (([L loc (GroupStmt (stmts', usedBinderMap) groupByClause')], thing), fvs)
rnNormalStmtsAndFindUsedBinders :: HsStmtContext Name
-> [LStmt RdrName]
where
go orig_lcl_env bndrs [] = do
let (bndrs', dups) = removeDups cmpByOcc bndrs
- inner_env = extendLocalRdrEnv orig_lcl_env bndrs'
+ inner_env = extendLocalRdrEnvList orig_lcl_env bndrs'
- mappM dupErr dups
+ mapM_ dupErr dups
(thing, fvs) <- setLocalRdrEnv inner_env thing_inside
return (([], thing), fvs)
-> RnM (thing, FreeVars)
-> RnM (([LStmt Name], thing), FreeVars)
rnMDoStmts stmts thing_inside
- = -- Step1: Bring all the binders of the mdo into scope
- -- (Remember that this also removes the binders from the
- -- finally-returned free-vars.)
- -- And rename each individual stmt, making a
- -- singleton segment. At this stage the FwdRefs field
- -- isn't finished: it's empty for all except a BindStmt
- -- for which it's the fwd refs within the bind itself
- -- (This set may not be empty, because we're in a recursive
- -- context.)
- rn_rec_stmts_and_then stmts $ \ segs -> do {
-
- ; (thing, fvs_later) <- thing_inside
-
- ; let
- -- Step 2: Fill in the fwd refs.
- -- The segments are all singletons, but their fwd-ref
- -- field mentions all the things used by the segment
- -- that are bound after their use
- segs_w_fwd_refs = addFwdRefs segs
-
- -- Step 3: Group together the segments to make bigger segments
- -- Invariant: in the result, no segment uses a variable
- -- bound in a later segment
+ = rn_rec_stmts_and_then stmts $ \ segs -> do
+ { (thing, fvs_later) <- thing_inside
+ ; let segs_w_fwd_refs = addFwdRefs segs
grouped_segs = glomSegments segs_w_fwd_refs
-
- -- Step 4: Turn the segments into Stmts
- -- Use RecStmt when and only when there are fwd refs
- -- Also gather up the uses from the end towards the
- -- start, so we can tell the RecStmt which things are
- -- used 'after' the RecStmt
- (stmts', fvs) = segsToStmts grouped_segs fvs_later
-
- ; return ((stmts', thing), fvs) }
+ (stmts', fvs) = segsToStmts emptyRecStmt grouped_segs fvs_later
+ ; return ((stmts', thing), fvs) }
---------------------------------------------
= failWith (badIpBinds (ptext (sLit "an mdo expression")) binds)
rn_rec_stmt_lhs fix_env (L loc (LetStmt (HsValBinds binds)))
- = do binds' <- rnValBindsLHS fix_env binds
+ = do (_bound_names, binds') <- rnValBindsLHS fix_env binds
return [(L loc (LetStmt (HsValBinds binds')),
-- Warning: this is bogus; see function invariant
emptyFVs
)]
-rn_rec_stmt_lhs fix_env (L _ (RecStmt stmts _ _ _ _)) -- Flatten Rec inside Rec
+-- XXX Do we need to do something with the return and mfix names?
+rn_rec_stmt_lhs fix_env (L _ (RecStmt { recS_stmts = stmts })) -- Flatten Rec inside Rec
= rn_rec_stmts_lhs fix_env stmts
rn_rec_stmt_lhs _ stmt@(L _ (ParStmt _)) -- Syntactically illegal in mdo
rn_rec_stmts_lhs :: MiniFixityEnv
-> [LStmt RdrName]
-> RnM [(LStmtLR Name RdrName, FreeVars)]
-rn_rec_stmts_lhs fix_env stmts =
- let boundNames = collectLStmtsBinders stmts
- doc = text "In a recursive mdo-expression"
- in do
- -- First do error checking: we need to check for dups here because we
- -- don't bind all of the variables from the Stmt at once
- -- with bindLocatedLocals.
- checkDupRdrNames doc boundNames
- mappM (rn_rec_stmt_lhs fix_env) stmts `thenM` \ ls -> returnM (concat ls)
+rn_rec_stmts_lhs fix_env stmts
+ = do { let boundNames = collectLStmtsBinders stmts
+ -- First do error checking: we need to check for dups here because we
+ -- don't bind all of the variables from the Stmt at once
+ -- with bindLocatedLocals.
+ ; checkDupRdrNames boundNames
+ ; ls <- mapM (rn_rec_stmt_lhs fix_env) stmts
+ ; return (concat ls) }
-- right-hand-sides
rn_rec_stmt _ (L loc (ExprStmt expr _ _)) _
= rnLExpr expr `thenM` \ (expr', fvs) ->
lookupSyntaxName thenMName `thenM` \ (then_op, fvs1) ->
- returnM [(emptyNameSet, fvs `plusFV` fvs1, emptyNameSet,
+ return [(emptyNameSet, fvs `plusFV` fvs1, emptyNameSet,
L loc (ExprStmt expr' then_op placeHolderType))]
rn_rec_stmt _ (L loc (BindStmt pat' expr _ _)) fv_pat
bndrs = mkNameSet (collectPatBinders pat')
fvs = fv_expr `plusFV` fv_pat `plusFV` fvs1 `plusFV` fvs2
in
- returnM [(bndrs, fvs, bndrs `intersectNameSet` fvs,
+ return [(bndrs, fvs, bndrs `intersectNameSet` fvs,
L loc (BindStmt pat' expr' bind_op fail_op))]
rn_rec_stmt _ (L _ (LetStmt binds@(HsIPBinds _))) _
(binds', du_binds) <-
-- fixities and unused are handled above in rn_rec_stmts_and_then
rnValBindsRHS (mkNameSet all_bndrs) binds'
- returnM [(duDefs du_binds, duUses du_binds,
+ return [(duDefs du_binds, duUses du_binds,
emptyNameSet, L loc (LetStmt (HsValBinds binds')))]
-- no RecStmt case becuase they get flattened above when doing the LHSes
-rn_rec_stmt _ stmt@(L _ (RecStmt _ _ _ _ _)) _
+rn_rec_stmt _ stmt@(L _ (RecStmt {})) _
= pprPanic "rn_rec_stmt: RecStmt" (ppr stmt)
-rn_rec_stmt _ stmt@(L _ (ParStmt _)) _ -- Syntactically illegal in mdo
+rn_rec_stmt _ stmt@(L _ (ParStmt {})) _ -- Syntactically illegal in mdo
= pprPanic "rn_rec_stmt: ParStmt" (ppr stmt)
-rn_rec_stmt _ stmt@(L _ (TransformStmt _ _ _)) _ -- Syntactically illegal in mdo
+rn_rec_stmt _ stmt@(L _ (TransformStmt {})) _ -- Syntactically illegal in mdo
= pprPanic "rn_rec_stmt: TransformStmt" (ppr stmt)
-rn_rec_stmt _ stmt@(L _ (GroupStmt _ _)) _ -- Syntactically illegal in mdo
+rn_rec_stmt _ stmt@(L _ (GroupStmt {})) _ -- Syntactically illegal in mdo
= pprPanic "rn_rec_stmt: GroupStmt" (ppr stmt)
rn_rec_stmt _ (L _ (LetStmt EmptyLocalBinds)) _
= panic "rn_rec_stmt: LetStmt EmptyLocalBinds"
rn_rec_stmts :: [Name] -> [(LStmtLR Name RdrName, FreeVars)] -> RnM [Segment (LStmt Name)]
-rn_rec_stmts bndrs stmts = mappM (uncurry (rn_rec_stmt bndrs)) stmts `thenM` \ segs_s ->
- returnM (concat segs_s)
+rn_rec_stmts bndrs stmts = mapM (uncurry (rn_rec_stmt bndrs)) stmts `thenM` \ segs_s ->
+ return (concat segs_s)
---------------------------------------------
addFwdRefs :: [Segment a] -> [Segment a]
----------------------------------------------------
-segsToStmts :: [Segment [LStmt Name]]
+segsToStmts :: Stmt Name -- A RecStmt with the SyntaxOps filled in
+ -> [Segment [LStmt Name]]
-> FreeVars -- Free vars used 'later'
-> ([LStmt Name], FreeVars)
-segsToStmts [] fvs_later = ([], fvs_later)
-segsToStmts ((defs, uses, fwds, ss) : segs) fvs_later
+segsToStmts _ [] fvs_later = ([], fvs_later)
+segsToStmts empty_rec_stmt ((defs, uses, fwds, ss) : segs) fvs_later
= ASSERT( not (null ss) )
(new_stmt : later_stmts, later_uses `plusFV` uses)
where
- (later_stmts, later_uses) = segsToStmts segs fvs_later
+ (later_stmts, later_uses) = segsToStmts empty_rec_stmt segs fvs_later
new_stmt | non_rec = head ss
- | otherwise = L (getLoc (head ss)) $
- RecStmt ss (nameSetToList used_later) (nameSetToList fwds)
- [] emptyLHsBinds
- where
- non_rec = isSingleton ss && isEmptyNameSet fwds
- used_later = defs `intersectNameSet` later_uses
+ | otherwise = L (getLoc (head ss)) rec_stmt
+ rec_stmt = empty_rec_stmt { recS_stmts = ss
+ , recS_later_ids = nameSetToList used_later
+ , recS_rec_ids = nameSetToList fwds }
+ non_rec = isSingleton ss && isEmptyNameSet fwds
+ used_later = defs `intersectNameSet` later_uses
-- The ones needed after the RecStmt
\end{code}
---------
checkRecStmt :: HsStmtContext Name -> RnM ()
checkRecStmt (MDoExpr {}) = return () -- Recursive stmt ok in 'mdo'
-checkRecStmt (DoExpr {}) = return () -- ..and in 'do' but only because of arrows:
- -- proc x -> do { ...rec... }
- -- We don't have enough context to distinguish this situation here
- -- so we leave it to the type checker
+checkRecStmt (DoExpr {}) = return () -- and in 'do'
checkRecStmt ctxt = addErr msg
where
msg = ptext (sLit "Illegal 'rec' stmt in") <+> pprStmtContext ctxt
checkTransformStmt ctxt = addErr msg
where
msg = ptext (sLit "Illegal transform or grouping in") <+> pprStmtContext ctxt
-
+
+---------
+checkTupleSection :: [HsTupArg RdrName] -> RnM ()
+checkTupleSection args
+ = do { tuple_section <- doptM Opt_TupleSections
+ ; checkErr (all tupArgPresent args || tuple_section) msg }
+ where
+ msg = ptext (sLit "Illegal tuple section: use -XTupleSections")
+
---------
sectionErr :: HsExpr RdrName -> SDoc
sectionErr expr