import RnHsSyn
import TcRnMonad
import RnEnv
+import OccName ( plusOccEnv )
import RnNames ( importsFromLocalDecls )
import RnTypes ( rnHsTypeFVs, rnPat, litFVs, rnOverLit, rnPatsAndThen,
- dupFieldErr, precParseErr, sectionPrecErr, patSigErr )
-import CmdLineOpts ( DynFlag(..), opt_IgnoreAsserts )
-import BasicTypes ( Fixity(..), FixityDirection(..), IPName(..),
- defaultFixity, negateFixity, compareFixity )
-import PrelNames ( hasKey, assertIdKey,
- foldrName, buildName,
- cCallableClassName, cReturnableClassName,
- enumClassName,
- splitName, fstName, sndName, ioDataConName,
- replicatePName, mapPName, filterPName,
- crossPName, zipPName, toPName,
- enumFromToPName, enumFromThenToPName, assertErrorName,
+ dupFieldErr, precParseErr, sectionPrecErr, patSigErr, checkTupSize )
+import CmdLineOpts ( DynFlag(..) )
+import BasicTypes ( Fixity(..), FixityDirection(..), negateFixity, compareFixity )
+import PrelNames ( hasKey, assertIdKey, assertErrorName,
+ loopAName, choiceAName, appAName, arrAName, composeAName, firstAName,
negateName, monadNames, mfixName )
-#ifdef GHCI
-import DsMeta ( qTyConName )
-#endif
import Name ( Name, nameOccName )
import NameSet
import UnicodeUtil ( stringToUtf8 )
import UniqFM ( isNullUFM )
import UniqSet ( emptyUniqSet )
import Util ( isSingleton )
-import List ( intersectBy, unzip4 )
+import List ( unzip4 )
import ListSetOps ( removeDups )
import Outputable
+import SrcLoc ( noSrcLoc )
import FastString
\end{code}
= addSrcLoc (getMatchLoc match) $
-- Deal with the rhs type signature
- bindPatSigTyVars rhs_sig_tys $
+ bindPatSigTyVarsFV rhs_sig_tys $
doptM Opt_GlasgowExts `thenM` \ opt_GlasgowExts ->
(case maybe_rhs_sig of
Nothing -> returnM (Nothing, emptyFVs)
) `thenM` \ (maybe_rhs_sig', ty_fvs) ->
-- Now the main event
- rnPatsAndThen ctxt pats $ \ pats' ->
- rnGRHSs ctxt grhss `thenM` \ (grhss', grhss_fvs) ->
+ rnPatsAndThen ctxt True pats $ \ pats' ->
+ rnGRHSs ctxt grhss `thenM` \ (grhss', grhss_fvs) ->
returnM (Match pats' maybe_rhs_sig' grhss', grhss_fvs `plusFV` ty_fvs)
- -- The bindPatSigTyVars and rnPatsAndThen will remove the bound FVs
+ -- The bindPatSigTyVarsFV and rnPatsAndThen will remove the bound FVs
where
rhs_sig_tys = case maybe_rhs_sig of
Nothing -> []
rnExpr (HsVar v)
= lookupOccRn v `thenM` \ name ->
- if name `hasKey` assertIdKey && not opt_IgnoreAsserts then
+ doptM Opt_IgnoreAsserts `thenM` \ ignore_asserts ->
+ if name `hasKey` assertIdKey && not ignore_asserts then
-- We expand it to (GHC.Err.assertError location_string)
- mkAssertErrorExpr
+ mkAssertErrorExpr `thenM` \ (e, fvs) ->
+ returnM (e, fvs `addOneFV` name)
+ -- Keep 'assert' as a free var, to ensure it's not reported as unused!
else
-- The normal case. Even if the Id was 'assert', if we are
-- ignoring assertions we leave it as GHC.Base.assert;
returnM (HsVar name, unitFV name)
rnExpr (HsIPVar v)
- = newIPName v `thenM` \ name ->
- let
- fvs = case name of
- Linear _ -> mkFVs [splitName, fstName, sndName]
- Dupable _ -> emptyFVs
- in
- returnM (HsIPVar name, fvs)
+ = newIPNameRn v `thenM` \ name ->
+ returnM (HsIPVar name, emptyFVs)
rnExpr (HsLit lit)
= litFVs lit `thenM` \ fvs ->
-- Deal with fixity
-- When renaming code synthesised from "deriving" declarations
- -- we're in Interface mode, and we should ignore fixity; assume
- -- that the deriving code generator got the association correct
- -- Don't even look up the fixity when in interface mode
- getModeRn `thenM` \ mode ->
- (if isInterfaceMode mode
- then returnM (OpApp e1' op' defaultFixity e2')
- else lookupFixityRn op_name `thenM` \ fixity ->
- mkOpAppRn e1' op' fixity e2'
- ) `thenM` \ final_e ->
+ -- we used to avoid fixity stuff, but we can't easily tell any
+ -- more, so I've removed the test. Adding HsPars in TcGenDeriv
+ -- should prevent bad things happening.
+ lookupFixityRn op_name `thenM` \ fixity ->
+ mkOpAppRn e1' op' fixity e2' `thenM` \ final_e ->
returnM (final_e,
fv_e1 `plusFV` fv_op `plusFV` fv_e2)
returnM (HsPar e', fvs_e)
-- Template Haskell extensions
-#ifdef GHCI
-rnExpr (HsBracket br_body)
- = checkGHCI (thErr "bracket") `thenM_`
- rnBracket br_body `thenM` \ (body', fvs_e) ->
- returnM (HsBracket body', fvs_e `addOneFV` qTyConName)
- -- We use the Q tycon as a proxy to haul in all the smart
- -- constructors; see the hack in RnIfaces
-#endif
-
-rnExpr (HsSplice n e)
- = checkGHCI (thErr "splice") `thenM_`
- getSrcLocM `thenM` \ loc ->
- newLocalsRn [(n,loc)] `thenM` \ [n'] ->
- rnExpr e `thenM` \ (e', fvs_e) ->
- returnM (HsSplice n' e', fvs_e)
+-- Don't ifdef-GHCI them because we want to fail gracefully
+-- (not with an rnExpr crash) in a stage-1 compiler.
+rnExpr e@(HsBracket br_body loc)
+ = addSrcLoc loc $
+ checkTH e "bracket" `thenM_`
+ rnBracket br_body `thenM` \ (body', fvs_e) ->
+ returnM (HsBracket body' loc, fvs_e)
+
+rnExpr e@(HsSplice n splice loc)
+ = addSrcLoc loc $
+ checkTH e "splice" `thenM_`
+ newLocalsRn [(n,loc)] `thenM` \ [n'] ->
+ rnExpr splice `thenM` \ (splice', fvs_e) ->
+ returnM (HsSplice n' splice' loc, fvs_e)
rnExpr section@(SectionL expr op)
= rnExpr expr `thenM` \ (expr', fvs_expr) ->
checkSectionPrec InfixR section op' expr' `thenM_`
returnM (SectionR op' expr', fvs_op `plusFV` fvs_expr)
-rnExpr (HsCCall fun args may_gc is_casm _)
- -- Check out the comment on RnIfaces.getNonWiredDataDecl about ccalls
- = rnExprs args `thenM` \ (args', fvs_args) ->
- returnM (HsCCall fun args' may_gc is_casm placeHolderType,
- fvs_args `plusFV` mkFVs [cCallableClassName,
- cReturnableClassName,
- ioDataConName])
+rnExpr (HsCoreAnn ann expr)
+ = rnExpr expr `thenM` \ (expr', fvs_expr) ->
+ returnM (HsCoreAnn ann expr', fvs_expr)
rnExpr (HsSCC lbl expr)
= rnExpr expr `thenM` \ (expr', fvs_expr) ->
rnExpr expr `thenM` \ (expr',fvExpr) ->
returnM (HsLet binds' expr', fvExpr)
-rnExpr (HsWith expr binds is_with)
- = warnIf is_with withWarning `thenM_`
- rnExpr expr `thenM` \ (expr',fvExpr) ->
- rnIPBinds binds `thenM` \ (binds',fvBinds) ->
- returnM (HsWith expr' binds' is_with, fvExpr `plusFV` fvBinds)
-
rnExpr e@(HsDo do_or_lc stmts _ _ src_loc)
= addSrcLoc src_loc $
rnStmts do_or_lc stmts `thenM` \ (stmts', fvs) ->
} `thenM_`
-- Generate the rebindable syntax for the monad
- mapAndUnzipM lookupSyntaxName
- (syntax_names do_or_lc) `thenM` \ (monad_names', monad_fvs) ->
+ lookupSyntaxNames syntax_names `thenM` \ (syntax_names', monad_fvs) ->
- returnM (HsDo do_or_lc stmts' monad_names' placeHolderType src_loc,
- fvs `plusFV` implicit_fvs do_or_lc `plusFV` plusFVs monad_fvs)
+ returnM (HsDo do_or_lc stmts' syntax_names' placeHolderType src_loc,
+ fvs `plusFV` monad_fvs)
where
- implicit_fvs PArrComp = mkFVs [replicatePName, mapPName, filterPName, crossPName, zipPName]
- implicit_fvs ListComp = mkFVs [foldrName, buildName]
- implicit_fvs DoExpr = emptyFVs
- implicit_fvs MDoExpr = emptyFVs
-
- syntax_names DoExpr = monadNames
- syntax_names MDoExpr = monadNames ++ [mfixName]
- syntax_names other = []
+ syntax_names = case do_or_lc of
+ DoExpr -> monadNames
+ MDoExpr -> monadNames ++ [mfixName]
+ other -> []
rnExpr (ExplicitList _ exps)
= rnExprs exps `thenM` \ (exps', fvs) ->
rnExpr (ExplicitPArr _ exps)
= rnExprs exps `thenM` \ (exps', fvs) ->
- returnM (ExplicitPArr placeHolderType exps',
- fvs `addOneFV` toPName `addOneFV` parrTyCon_name)
+ returnM (ExplicitPArr placeHolderType exps', fvs)
-rnExpr (ExplicitTuple exps boxity)
- = rnExprs exps `thenM` \ (exps', fvs) ->
+rnExpr e@(ExplicitTuple exps boxity)
+ = checkTupSize tup_size `thenM_`
+ rnExprs exps `thenM` \ (exps', fvs) ->
returnM (ExplicitTuple exps' boxity, fvs `addOneFV` tycon_name)
where
- tycon_name = tupleTyCon_name boxity (length exps)
+ tup_size = length exps
+ tycon_name = tupleTyCon_name boxity tup_size
rnExpr (RecordCon con_id rbinds)
= lookupOccRn con_id `thenM` \ conname ->
rnExpr (ArithSeqIn seq)
= rnArithSeq seq `thenM` \ (new_seq, fvs) ->
- returnM (ArithSeqIn new_seq, fvs `addOneFV` enumClassName)
+ returnM (ArithSeqIn new_seq, fvs)
rnExpr (PArrSeqIn seq)
= rnArithSeq seq `thenM` \ (new_seq, fvs) ->
- returnM (PArrSeqIn new_seq,
- fvs `plusFV` mkFVs [enumFromToPName, enumFromThenToPName])
+ returnM (PArrSeqIn new_seq, fvs)
\end{code}
These three are pattern syntax appearing in expressions.
%************************************************************************
%* *
+ Arrow notation
+%* *
+%************************************************************************
+
+\begin{code}
+rnExpr (HsProc pat body src_loc)
+ = addSrcLoc src_loc $
+ rnPatsAndThen ProcExpr True [pat] $ \ [pat'] ->
+ rnCmdTop body `thenM` \ (body',fvBody) ->
+ returnM (HsProc pat' body' src_loc, fvBody)
+
+rnExpr (HsArrApp arrow arg _ ho rtl srcloc)
+ = rnExpr arrow `thenM` \ (arrow',fvArrow) ->
+ rnExpr arg `thenM` \ (arg',fvArg) ->
+ returnM (HsArrApp arrow' arg' placeHolderType ho rtl srcloc,
+ fvArrow `plusFV` fvArg)
+
+-- infix form
+rnExpr (HsArrForm op (Just _) [arg1, arg2] srcloc)
+ = rnExpr op `thenM` \ (op'@(HsVar op_name),fv_op) ->
+ rnCmdTop arg1 `thenM` \ (arg1',fv_arg1) ->
+ rnCmdTop arg2 `thenM` \ (arg2',fv_arg2) ->
+
+ -- Deal with fixity
+
+ lookupFixityRn op_name `thenM` \ fixity ->
+ mkOpFormRn arg1' op' fixity arg2' `thenM` \ final_e ->
+
+ returnM (final_e,
+ fv_arg1 `plusFV` fv_op `plusFV` fv_arg2)
+
+rnExpr (HsArrForm op fixity cmds srcloc)
+ = rnExpr op `thenM` \ (op',fvOp) ->
+ rnCmdArgs cmds `thenM` \ (cmds',fvCmds) ->
+ returnM (HsArrForm op' fixity cmds' srcloc,
+ fvOp `plusFV` fvCmds)
+
+---------------------------
+-- Deal with fixity (cf mkOpAppRn for the method)
+
+mkOpFormRn :: RenamedHsCmdTop -- Left operand; already rearranged
+ -> RenamedHsExpr -> Fixity -- Operator and fixity
+ -> RenamedHsCmdTop -- Right operand (not an infix)
+ -> RnM RenamedHsCmd
+
+---------------------------
+-- (e11 `op1` e12) `op2` e2
+mkOpFormRn a1@(HsCmdTop (HsArrForm op1 (Just fix1) [a11,a12] loc1) _ _ _) op2 fix2 a2
+ | nofix_error
+ = addErr (precParseErr (ppr_op op1,fix1) (ppr_op op2,fix2)) `thenM_`
+ returnM (HsArrForm op2 (Just fix2) [a1, a2] loc1)
+
+ | associate_right
+ = mkOpFormRn a12 op2 fix2 a2 `thenM` \ new_c ->
+ returnM (HsArrForm op1 (Just fix1)
+ [a11, HsCmdTop new_c [] placeHolderType []] loc1)
+ where
+ (nofix_error, associate_right) = compareFixity fix1 fix2
+
+---------------------------
+-- Default case
+mkOpFormRn arg1 op fix arg2 -- Default case, no rearrangment
+ = returnM (HsArrForm op (Just fix) [arg1, arg2] noSrcLoc)
+
+\end{code}
+
+
+%************************************************************************
+%* *
+ Arrow commands
+%* *
+%************************************************************************
+
+\begin{code}
+rnCmdArgs [] = returnM ([], emptyFVs)
+rnCmdArgs (arg:args)
+ = rnCmdTop arg `thenM` \ (arg',fvArg) ->
+ rnCmdArgs args `thenM` \ (args',fvArgs) ->
+ returnM (arg':args', fvArg `plusFV` fvArgs)
+
+rnCmdTop (HsCmdTop cmd _ _ _)
+ = rnExpr (convertOpFormsCmd cmd) `thenM` \ (cmd', fvCmd) ->
+ let
+ cmd_names = [arrAName, composeAName, firstAName] ++
+ nameSetToList (methodNamesCmd cmd')
+ in
+ -- Generate the rebindable syntax for the monad
+ lookupSyntaxNames cmd_names `thenM` \ (cmd_names', cmd_fvs) ->
+
+ returnM (HsCmdTop cmd' [] placeHolderType cmd_names',
+ fvCmd `plusFV` cmd_fvs)
+
+---------------------------------------------------
+-- convert OpApp's in a command context to HsArrForm's
+
+convertOpFormsCmd :: HsCmd id -> HsCmd id
+
+convertOpFormsCmd (HsApp c e) = HsApp (convertOpFormsCmd c) e
+
+convertOpFormsCmd (HsLam match) = HsLam (convertOpFormsMatch match)
+
+convertOpFormsCmd (OpApp c1 op fixity c2)
+ = let
+ arg1 = HsCmdTop (convertOpFormsCmd c1) [] placeHolderType []
+ arg2 = HsCmdTop (convertOpFormsCmd c2) [] placeHolderType []
+ in
+ HsArrForm op (Just fixity) [arg1, arg2] noSrcLoc
+
+convertOpFormsCmd (HsPar c) = HsPar (convertOpFormsCmd c)
+
+convertOpFormsCmd (HsCase exp matches locn)
+ = HsCase exp (map convertOpFormsMatch matches) locn
+
+convertOpFormsCmd (HsIf exp c1 c2 locn)
+ = HsIf exp (convertOpFormsCmd c1) (convertOpFormsCmd c2) locn
+
+convertOpFormsCmd (HsLet binds cmd)
+ = HsLet binds (convertOpFormsCmd cmd)
+
+convertOpFormsCmd (HsDo ctxt stmts ids ty locn)
+ = HsDo ctxt (map convertOpFormsStmt stmts) ids ty locn
+
+-- Anything else is unchanged. This includes HsArrForm (already done),
+-- things with no sub-commands, and illegal commands (which will be
+-- caught by the type checker)
+convertOpFormsCmd c = c
+
+convertOpFormsStmt (BindStmt pat cmd locn)
+ = BindStmt pat (convertOpFormsCmd cmd) locn
+convertOpFormsStmt (ResultStmt cmd locn)
+ = ResultStmt (convertOpFormsCmd cmd) locn
+convertOpFormsStmt (ExprStmt cmd ty locn)
+ = ExprStmt (convertOpFormsCmd cmd) ty locn
+convertOpFormsStmt (RecStmt stmts lvs rvs es)
+ = RecStmt (map convertOpFormsStmt stmts) lvs rvs es
+convertOpFormsStmt stmt = stmt
+
+convertOpFormsMatch (Match pat mty grhss)
+ = Match pat mty (convertOpFormsGRHSs grhss)
+
+convertOpFormsGRHSs (GRHSs grhss binds ty)
+ = GRHSs (map convertOpFormsGRHS grhss) binds ty
+
+convertOpFormsGRHS (GRHS stmts locn)
+ = let
+ (ResultStmt cmd locn') = last stmts
+ in
+ GRHS (init stmts ++ [ResultStmt (convertOpFormsCmd cmd) locn']) locn
+
+---------------------------------------------------
+type CmdNeeds = FreeVars -- Only inhabitants are
+ -- appAName, choiceAName, loopAName
+
+-- find what methods the Cmd needs (loop, choice, apply)
+methodNamesCmd :: HsCmd Name -> CmdNeeds
+
+methodNamesCmd cmd@(HsArrApp _arrow _arg _ HsFirstOrderApp _rtl _srcloc)
+ = emptyFVs
+methodNamesCmd cmd@(HsArrApp _arrow _arg _ HsHigherOrderApp _rtl _srcloc)
+ = unitFV appAName
+methodNamesCmd cmd@(HsArrForm {}) = emptyFVs
+
+methodNamesCmd (HsPar c) = methodNamesCmd c
+
+methodNamesCmd (HsIf p c1 c2 loc)
+ = methodNamesCmd c1 `plusFV` methodNamesCmd c2 `addOneFV` choiceAName
+
+methodNamesCmd (HsLet b c) = methodNamesCmd c
+
+methodNamesCmd (HsDo sc stmts rbs ty loc) = methodNamesStmts stmts
+
+methodNamesCmd (HsApp c e) = methodNamesCmd c
+
+methodNamesCmd (HsLam match) = methodNamesMatch match
+
+methodNamesCmd (HsCase scrut matches loc)
+ = plusFVs (map methodNamesMatch matches) `addOneFV` choiceAName
+
+methodNamesCmd other = emptyFVs
+ -- Other forms can't occur in commands, but it's not convenient
+ -- to error here so we just do what's convenient.
+ -- The type checker will complain later
+
+---------------------------------------------------
+methodNamesMatch (Match pats sig_ty grhss) = methodNamesGRHSs grhss
+
+-------------------------------------------------
+methodNamesGRHSs (GRHSs grhss binds ty) = plusFVs (map methodNamesGRHS grhss)
+
+-------------------------------------------------
+methodNamesGRHS (GRHS stmts loc) = methodNamesStmt (last stmts)
+
+---------------------------------------------------
+methodNamesStmts stmts = plusFVs (map methodNamesStmt stmts)
+
+---------------------------------------------------
+methodNamesStmt (ResultStmt cmd loc) = methodNamesCmd cmd
+methodNamesStmt (ExprStmt cmd ty loc) = methodNamesCmd cmd
+methodNamesStmt (BindStmt pat cmd loc) = methodNamesCmd cmd
+methodNamesStmt (RecStmt stmts lvs rvs es)
+ = methodNamesStmts stmts `addOneFV` loopAName
+methodNamesStmt (LetStmt b) = emptyFVs
+methodNamesStmt (ParStmt ss) = emptyFVs
+ -- ParStmt can't occur in commands, but it's not convenient to error
+ -- here so we just do what's convenient
+\end{code}
+
+
+%************************************************************************
+%* *
Arithmetic sequences
%* *
%************************************************************************
%************************************************************************
%* *
-\subsubsection{@rnIPBinds@s: in implicit parameter bindings} *
-%* *
-%************************************************************************
-
-\begin{code}
-rnIPBinds [] = returnM ([], emptyFVs)
-rnIPBinds ((n, expr) : binds)
- = newIPName n `thenM` \ name ->
- rnExpr expr `thenM` \ (expr',fvExpr) ->
- rnIPBinds binds `thenM` \ (binds',fvBinds) ->
- returnM ((name, expr') : binds', fvExpr `plusFV` fvBinds)
-
-\end{code}
-
-%************************************************************************
-%* *
Template Haskell brackets
%* *
%************************************************************************
\begin{code}
+rnBracket (VarBr n) = lookupOccRn n `thenM` \ name ->
+ returnM (VarBr name, unitFV name)
rnBracket (ExpBr e) = rnExpr e `thenM` \ (e', fvs) ->
returnM (ExpBr e', fvs)
rnBracket (PatBr p) = rnPat p `thenM` \ (p', fvs) ->
= importsFromLocalDecls group `thenM` \ (rdr_env, avails) ->
-- Discard avails (not useful here)
- updGblEnv (\gbl -> gbl { tcg_rdr_env = rdr_env `plusGlobalRdrEnv` tcg_rdr_env gbl }) $
+ updGblEnv (\gbl -> gbl { tcg_rdr_env = tcg_rdr_env gbl `plusOccEnv` rdr_env}) $
+ -- Notice plusOccEnv, not plusGlobalRdrEnv. In this situation we want
+ -- to *shadow* top-level bindings. E.g.
+ -- foo = 1
+ -- bar = [d| foo = 1|]
+ -- So we drop down to plusOccEnv. (Perhaps there should be a fn in RdrName.)
- rnSrcDecls group `thenM` \ (tcg_env, group', fvs) ->
+ rnSrcDecls group `thenM` \ (tcg_env, group') ->
-- Discard the tcg_env; it contains only extra info about fixity
-
- returnM (DecBr group', fvs)
+ let
+ dus = tcg_dus tcg_env
+ in
+ returnM (DecBr group', allUses dus)
\end{code}
%************************************************************************
-- Happens at the end of the sub-lists of a ParStmts
rnNormalStmts ctxt (ExprStmt expr _ src_loc : stmts)
- = addSrcLoc src_loc $
- rnExpr expr `thenM` \ (expr', fv_expr) ->
+ = addSrcLoc src_loc $
+ rnExpr expr `thenM` \ (expr', fv_expr) ->
rnNormalStmts ctxt stmts `thenM` \ (stmts', fvs) ->
returnM (ExprStmt expr' placeHolderType src_loc : stmts',
fv_expr `plusFV` fvs)
rnExpr expr `thenM` \ (expr', fv_expr) ->
-- The binders do not scope over the expression
- rnPatsAndThen (StmtCtxt ctxt) [pat] $ \ [pat'] ->
- rnNormalStmts ctxt stmts `thenM` \ (stmts', fvs) ->
+ let
+ reportUnused =
+ case ctxt of
+ ParStmtCtxt{} -> False
+ _ -> True
+ in
+ rnPatsAndThen (StmtCtxt ctxt) reportUnused [pat] $ \ [pat'] ->
+ rnNormalStmts ctxt stmts `thenM` \ (stmts', fvs) ->
returnM (BindStmt pat' expr' src_loc : stmts',
fv_expr `plusFV` fvs) -- fv_expr shouldn't really be filtered by
-- the rnPatsAndThen, but it does not matter
rnNormalStmts ctxt (LetStmt binds : stmts)
- = rnBindsAndThen binds $ \ binds' ->
- rnNormalStmts ctxt stmts `thenM` \ (stmts', fvs) ->
- returnM (LetStmt binds' : stmts', fvs)
+ = checkErr (ok ctxt binds) (badIpBinds binds) `thenM_`
+ rnBindsAndThen binds ( \ binds' ->
+ rnNormalStmts ctxt stmts `thenM` \ (stmts', fvs) ->
+ returnM (LetStmt binds' : stmts', fvs))
+ where
+ -- We do not allow implicit-parameter bindings in a parallel
+ -- list comprehension. I'm not sure what it might mean.
+ ok (ParStmtCtxt _) (IPBinds _) = False
+ ok _ _ = True
rnNormalStmts ctxt (ParStmt stmtss : stmts)
- = mapFvRn (rnNormalStmts ctxt) stmtss `thenM` \ (stmtss', fv_stmtss) ->
+ = doptM Opt_GlasgowExts `thenM` \ opt_GlasgowExts ->
+ checkM opt_GlasgowExts parStmtErr `thenM_`
+ mapFvRn rn_branch stmtss `thenM` \ (stmtss', fv_stmtss) ->
let
- bndrss = map collectStmtsBinders stmtss'
+ bndrss :: [[Name]] -- NB: Name, not RdrName
+ bndrss = map collectStmtsBinders stmtss'
+ (bndrs, dups) = removeDups cmpByOcc (concat bndrss)
in
- foldlM checkBndrs [] bndrss `thenM` \ new_binders ->
- bindLocalNamesFV new_binders $
+ mappM dupErr dups `thenM` \ _ ->
+ bindLocalNamesFV bndrs $
-- Note: binders are returned in scope order, so one may
-- shadow the next; e.g. x <- xs; x <- ys
rnNormalStmts ctxt stmts `thenM` \ (stmts', fvs) ->
- returnM (ParStmtOut (bndrss `zip` stmtss') : stmts',
+
+ -- Cut down the exported binders to just the ones needed in the body
+ let
+ used_bndrs_s = map (filter (`elemNameSet` fvs)) bndrss
+ unused_bndrs = filter (not . (`elemNameSet` fvs)) bndrs
+ in
+ -- With processing of the branches and the tail of comprehension done,
+ -- we can finally compute&report any unused ParStmt binders.
+ warnUnusedMatches unused_bndrs `thenM_`
+ returnM (ParStmt (stmtss' `zip` used_bndrs_s) : stmts',
fv_stmtss `plusFV` fvs)
-
where
- checkBndrs all_bndrs bndrs
- = checkErr (null common) (err (head common)) `thenM_`
- returnM (bndrs ++ all_bndrs)
- where
- common = intersectBy eqOcc all_bndrs bndrs
+ rn_branch (stmts, _) = rnNormalStmts (ParStmtCtxt ctxt) stmts
- eqOcc n1 n2 = nameOccName n1 == nameOccName n2
- err v = ptext SLIT("Duplicate binding in parallel list comprehension for:")
- <+> quotes (ppr v)
+ cmpByOcc n1 n2 = nameOccName n1 `compare` nameOccName n2
+ dupErr (v:_) = addErr (ptext SLIT("Duplicate binding in parallel list comprehension for:")
+ <+> quotes (ppr v))
-rnNormalStmts ctxt stmts = pprPanic "rnNormalStmts" (ppr stmts)
+rnNormalStmts ctxt (RecStmt rec_stmts _ _ _ : stmts)
+ = bindLocalsRn doc (collectStmtsBinders rec_stmts) $ \ _ ->
+ rn_rec_stmts rec_stmts `thenM` \ segs ->
+ rnNormalStmts ctxt stmts `thenM` \ (stmts', fvs) ->
+ let
+ 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
+ in
+ returnM (RecStmt rec_stmts' later_vars fwd_vars [] : stmts', uses `plusFV` fvs)
+ where
+ doc = text "In a recursive do statement"
\end{code}
%************************************************************************
%* *
-\subsubsection{Precedence Parsing}
+\subsubsection{mdo expressions}
%* *
%************************************************************************
\begin{code}
-type Defs = NameSet
-type Uses = NameSet -- Same as FreeVars really
type FwdRefs = NameSet
-type Segment = (Defs,
- Uses, -- May include defs
- FwdRefs, -- A subset of uses that are
+type Segment stmts = (Defs,
+ Uses, -- May include defs
+ FwdRefs, -- A subset of uses that are
-- (a) used before they are bound in this segment, or
-- (b) used here, and bound in subsequent segments
- [RenamedStmt])
+ stmts) -- Either Stmt or [Stmt]
+
----------------------------------------------------
rnMDoStmts :: [RdrNameStmt] -> RnM ([RenamedStmt], FreeVars)
rnMDoStmts stmts
= -- Step1: bring all the binders of the mdo into scope
+ -- Remember that this also removes the binders from the
+ -- finally-returned free-vars
bindLocalsRn doc (collectStmtsBinders stmts) $ \ _ ->
-- Step 2: 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
- mappM rn_mdo_stmt stmts `thenM` \ segs ->
+ -- (This set may not be empty, because we're in a recursive
+ -- context.)
+ rn_rec_stmts stmts `thenM` \ segs ->
let
-- Step 3: Fill in the fwd refs.
-- The segments are all singletons, but their fwd-ref
where
doc = text "In a mdo-expression"
+
----------------------------------------------------
-rn_mdo_stmt :: RdrNameStmt -> RnM Segment
+rn_rec_stmt :: RdrNameStmt -> RnM [Segment RenamedStmt]
+ -- Rename a Stmt that is inside a RecStmt (or mdo)
-- Assumes all binders are already in scope
-- Turns each stmt into a singleton Stmt
-rn_mdo_stmt (ExprStmt expr _ src_loc)
+rn_rec_stmt (ExprStmt expr _ src_loc)
= addSrcLoc src_loc (rnExpr expr) `thenM` \ (expr', fvs) ->
- returnM (emptyNameSet, fvs, emptyNameSet,
- [ExprStmt expr' placeHolderType src_loc])
+ returnM [(emptyNameSet, fvs, emptyNameSet,
+ ExprStmt expr' placeHolderType src_loc)]
-rn_mdo_stmt (ResultStmt expr src_loc)
+rn_rec_stmt (ResultStmt expr src_loc)
= addSrcLoc src_loc (rnExpr expr) `thenM` \ (expr', fvs) ->
- returnM (emptyNameSet, fvs, emptyNameSet,
- [ResultStmt expr' src_loc])
+ returnM [(emptyNameSet, fvs, emptyNameSet,
+ ResultStmt expr' src_loc)]
-rn_mdo_stmt (BindStmt pat expr src_loc)
+rn_rec_stmt (BindStmt pat expr src_loc)
= addSrcLoc src_loc $
rnExpr expr `thenM` \ (expr', fv_expr) ->
rnPat pat `thenM` \ (pat', fv_pat) ->
bndrs = mkNameSet (collectPatBinders pat')
fvs = fv_expr `plusFV` fv_pat
in
- returnM (bndrs, fvs, bndrs `intersectNameSet` fvs,
- [BindStmt pat' expr' src_loc])
+ returnM [(bndrs, fvs, bndrs `intersectNameSet` fvs,
+ BindStmt pat' expr' src_loc)]
+
+rn_rec_stmt (LetStmt binds)
+ = rnBinds binds `thenM` \ (binds', du_binds) ->
+ returnM [(duDefs du_binds, duUses du_binds,
+ emptyNameSet, LetStmt binds')]
+
+rn_rec_stmt (RecStmt stmts _ _ _) -- Flatten Rec inside Rec
+ = rn_rec_stmts stmts
-rn_mdo_stmt (LetStmt binds)
- = rnBinds binds `thenM` \ (binds', fv_binds) ->
- returnM (mkNameSet (collectHsBinders binds'),
- fv_binds, emptyNameSet, [LetStmt binds'])
+rn_rec_stmt stmt@(ParStmt _) -- Syntactically illegal in mdo
+ = pprPanic "rn_rec_stmt" (ppr stmt)
-rn_mdo_stmt stmt@(ParStmt _) -- Syntactically illegal in mdo
- = pprPanic "rn_mdo_stmt" (ppr stmt)
+---------------------------------------------
+rn_rec_stmts :: [RdrNameStmt] -> RnM [Segment RenamedStmt]
+rn_rec_stmts stmts = mappM rn_rec_stmt stmts `thenM` \ segs_s ->
+ returnM (concat segs_s)
-addFwdRefs :: [Segment] -> [Segment]
+---------------------------------------------
+addFwdRefs :: [Segment a] -> [Segment a]
-- So far the segments only have forward refs *within* the Stmt
-- (which happens for bind: x <- ...x...)
-- This function adds the cross-seg fwd ref info
addFwdRefs pairs
= fst (foldr mk_seg ([], emptyNameSet) pairs)
where
- mk_seg (defs, uses, fwds, stmts) (segs, seg_defs)
+ mk_seg (defs, uses, fwds, stmts) (segs, later_defs)
= (new_seg : segs, all_defs)
where
new_seg = (defs, uses, new_fwds, stmts)
- all_defs = seg_defs `unionNameSets` defs
- new_fwds = fwds `unionNameSets` (uses `intersectNameSet` seg_defs)
+ all_defs = later_defs `unionNameSets` defs
+ new_fwds = fwds `unionNameSets` (uses `intersectNameSet` later_defs)
-- Add the downstream fwd refs here
----------------------------------------------------
-- q <- x ; z <- y } ;
-- r <- x }
-glomSegments :: [Segment] -> [Segment]
+glomSegments :: [Segment RenamedStmt] -> [Segment [RenamedStmt]]
-glomSegments [seg] = [seg]
-glomSegments ((defs,uses,fwds,stmts) : segs)
+glomSegments [] = []
+glomSegments ((defs,uses,fwds,stmt) : segs)
-- Actually stmts will always be a singleton
= (seg_defs, seg_uses, seg_fwds, seg_stmts) : others
where
seg_defs = plusFVs ds `plusFV` defs
seg_uses = plusFVs us `plusFV` uses
seg_fwds = plusFVs fs `plusFV` fwds
- seg_stmts = stmts ++ concat ss
+ seg_stmts = stmt : concat ss
grab :: NameSet -- The client
- -> [Segment]
- -> ([Segment], -- Needed by the 'client'
- [Segment]) -- Not needed by the client
+ -> [Segment a]
+ -> ([Segment a], -- Needed by the 'client'
+ [Segment a]) -- Not needed by the client
-- The result is simply a split of the input
grab uses dus
= (reverse yeses, reverse noes)
----------------------------------------------------
-segsToStmts :: [Segment] -> ([RenamedStmt], FreeVars)
+segsToStmts :: [Segment [RenamedStmt]] -> ([RenamedStmt], FreeVars)
segsToStmts [] = ([], emptyFVs)
segsToStmts ((defs, uses, fwds, ss) : segs)
where
(later_stmts, later_uses) = segsToStmts segs
new_stmt | non_rec = head ss
- | otherwise = RecStmt rec_names ss
+ | otherwise = RecStmt ss (nameSetToList used_later) (nameSetToList fwds) []
where
- non_rec = isSingleton ss && isEmptyNameSet fwds
- rec_names = nameSetToList (fwds `plusFV` (defs `intersectNameSet` later_uses))
- -- The names for the fixpoint are
- -- (a) the ones needed after the RecStmt
- -- (b) the forward refs within the fixpoint
+ non_rec = isSingleton ss && isEmptyNameSet fwds
+ used_later = defs `intersectNameSet` later_uses
+ -- The ones needed after the RecStmt
\end{code}
%************************************************************************
= True
-- Parser initially makes negation bind more tightly than any other operator
+-- And "deriving" code should respect this (use HsPar if not)
mkNegAppRn neg_arg neg_name
- =
-#ifdef DEBUG
- getModeRn `thenM` \ mode ->
- ASSERT( not_op_app mode neg_arg )
-#endif
+ = ASSERT( not_op_app neg_arg )
returnM (NegApp neg_arg neg_name)
-not_op_app SourceMode (OpApp _ _ _ _) = False
-not_op_app mode other = True
+not_op_app (OpApp _ _ _ _) = False
+not_op_app other = True
\end{code}
\begin{code}
checkPrecMatch True op (Match (p1:p2:_) _ _)
-- True indicates an infix lhs
- = getModeRn `thenM` \ mode ->
- -- See comments with rnExpr (OpApp ...)
- if isInterfaceMode mode
- then returnM ()
- else checkPrec op p1 False `thenM_`
- checkPrec op p2 True
+ = -- See comments with rnExpr (OpApp ...) about "deriving"
+ checkPrec op p1 False `thenM_`
+ checkPrec op p2 True
checkPrecMatch True op _ = panic "checkPrecMatch"
expr = HsApp (HsVar assertErrorName) (HsLit msg)
msg = HsStringPrim (mkFastString (stringToUtf8 (showSDoc (ppr sloc))))
in
- returnM (expr, unitFV assertErrorName)
+ returnM (expr, emptyFVs)
\end{code}
%************************************************************************
MDoExpr -> "mdo"
other -> "do"
-thErr what
- = ptext SLIT("Template Haskell") <+> text what <+>
- ptext SLIT("illegal in a stage-1 compiler")
+#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
+parStmtErr = addErr (ptext SLIT("Illegal parallel list comprehension: use -fglasgow-exts"))
-withWarning
- = sep [quotes (ptext SLIT("with")),
- ptext SLIT("is deprecated, use"),
- quotes (ptext SLIT("let")),
- ptext SLIT("instead")]
+badIpBinds binds
+ = hang (ptext SLIT("Implicit-parameter bindings illegal in a parallel list comprehension:")) 4
+ (ppr binds)
\end{code}
projects / ghc-hetmet.git / blobdiff