%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[RnExpr]{Renaming of expressions}
Basically dependency analysis.
-Handles @Match@, @GRHSsAndBinds@, @HsExpr@, and @Qual@ datatypes. In
+Handles @Match@, @GRHSs@, @HsExpr@, and @Qualifier@ datatypes. In
general, all of these functions return a renamed thing, and a set of
free variables.
\begin{code}
-#include "HsVersions.h"
-
module RnExpr (
- rnMatch, rnGRHSsAndBinds, rnPat,
+ rnMatch, rnGRHSs, rnPat, rnExpr, rnExprs, rnStmt,
checkPrecMatch
) where
-import Ubiq
-import RnLoop -- break the RnPass/RnExpr/RnBinds loops
+#include "HsVersions.h"
+
+import {-# SOURCE #-} RnBinds ( rnBinds )
import HsSyn
import RdrHsSyn
import RnHsSyn
import RnMonad
-
-import ErrUtils ( addErrLoc )
-import Name ( isLocallyDefinedName, pprSym, Name, RdrName )
-import Pretty
-import UniqFM ( lookupUFM )
-import UniqSet ( emptyUniqSet, unitUniqSet,
- unionUniqSets, unionManyUniqSets,
- UniqSet(..) )
-import Util ( Ord3(..), panic )
+import RnEnv
+import RnTypes ( rnHsTypeFVs, precParseErr, sectionPrecErr )
+import CmdLineOpts ( DynFlag(..), opt_IgnoreAsserts )
+import Literal ( inIntRange, inCharRange )
+import BasicTypes ( Fixity(..), FixityDirection(..), IPName(..),
+ defaultFixity, negateFixity, compareFixity )
+import PrelNames ( hasKey, assertIdKey,
+ eqClassName, foldrName, buildName, eqStringName,
+ cCallableClassName, cReturnableClassName,
+ monadClassName, enumClassName, ordClassName,
+ ratioDataConName, splitName, fstName, sndName,
+ ioDataConName, plusIntegerName, timesIntegerName,
+ assertErr_RDR,
+ replicatePName, mapPName, filterPName,
+ falseDataConName, trueDataConName, crossPName,
+ zipPName, lengthPName, indexPName, toPName,
+ enumFromToPName, enumFromThenToPName,
+ fromIntegerName, fromRationalName, minusName, negateName,
+ failMName, bindMName, thenMName, returnMName )
+import TysPrim ( charPrimTyCon, addrPrimTyCon, intPrimTyCon,
+ floatPrimTyCon, doublePrimTyCon )
+import TysWiredIn ( intTyCon )
+import Name ( NamedThing(..), mkSystemName, nameSrcLoc )
+import NameSet
+import UnicodeUtil ( stringToUtf8 )
+import UniqFM ( isNullUFM )
+import UniqSet ( emptyUniqSet )
+import List ( intersectBy )
+import ListSetOps ( removeDups )
+import Outputable
+import FastString
\end{code}
*********************************************************
\begin{code}
-rnPat :: RdrNamePat -> RnM_Fixes s RenamedPat
+rnPat :: RdrNamePat -> RnMS (RenamedPat, FreeVars)
-rnPat WildPatIn = returnRn WildPatIn
+rnPat WildPatIn = returnRn (WildPatIn, emptyFVs)
rnPat (VarPatIn name)
- = lookupValue name `thenRn` \ vname ->
- returnRn (VarPatIn vname)
-
-rnPat (LitPatIn n) = returnRn (LitPatIn n)
+ = lookupBndrRn name `thenRn` \ vname ->
+ returnRn (VarPatIn vname, emptyFVs)
+
+rnPat (SigPatIn pat ty)
+ = doptRn Opt_GlasgowExts `thenRn` \ glaExts ->
+
+ if glaExts
+ then rnPat pat `thenRn` \ (pat', fvs1) ->
+ rnHsTypeFVs doc ty `thenRn` \ (ty', fvs2) ->
+ returnRn (SigPatIn pat' ty', fvs1 `plusFV` fvs2)
+
+ else addErrRn (patSigErr ty) `thenRn_`
+ rnPat pat
+ where
+ doc = text "a pattern type-signature"
+
+rnPat (LitPatIn s@(HsString _))
+ = returnRn (LitPatIn s, unitFV eqStringName)
+
+rnPat (LitPatIn lit)
+ = litFVs lit `thenRn` \ fvs ->
+ returnRn (LitPatIn lit, fvs)
+
+rnPat (NPatIn lit mb_neg)
+ = rnOverLit lit `thenRn` \ (lit', fvs1) ->
+ (case mb_neg of
+ Nothing -> returnRn (Nothing, emptyFVs)
+ Just neg -> lookupSyntaxName neg `thenRn` \ neg' ->
+ returnRn (Just neg', unitFV neg')
+ ) `thenRn` \ (mb_neg', fvs2) ->
+ returnRn (NPatIn lit' mb_neg',
+ fvs1 `plusFV` fvs2 `addOneFV` eqClassName)
+ -- Needed to find equality on pattern
+
+rnPat (NPlusKPatIn name lit _)
+ = rnOverLit lit `thenRn` \ (lit', fvs) ->
+ lookupBndrRn name `thenRn` \ name' ->
+ lookupSyntaxName minusName `thenRn` \ minus ->
+ returnRn (NPlusKPatIn name' lit' minus,
+ fvs `addOneFV` ordClassName `addOneFV` minus)
rnPat (LazyPatIn pat)
- = rnPat pat `thenRn` \ pat' ->
- returnRn (LazyPatIn pat')
+ = rnPat pat `thenRn` \ (pat', fvs) ->
+ returnRn (LazyPatIn pat', fvs)
rnPat (AsPatIn name pat)
- = rnPat pat `thenRn` \ pat' ->
- lookupValue name `thenRn` \ vname ->
- returnRn (AsPatIn vname pat')
-
-rnPat (ConPatIn name pats)
- = lookupValue name `thenRn` \ name' ->
- mapRn rnPat pats `thenRn` \ patslist ->
- returnRn (ConPatIn name' patslist)
-
-rnPat (ConOpPatIn pat1 name pat2)
- = lookupValue name `thenRn` \ name' ->
- rnPat pat1 `thenRn` \ pat1' ->
- rnPat pat2 `thenRn` \ pat2' ->
- precParsePat (ConOpPatIn pat1' name' pat2')
-
-rnPat neg@(NegPatIn pat)
- = getSrcLocRn `thenRn` \ src_loc ->
- addErrIfRn (not (valid_neg_pat pat)) (negPatErr neg src_loc)
- `thenRn_`
- rnPat pat `thenRn` \ pat' ->
- returnRn (NegPatIn pat')
- where
- valid_neg_pat (LitPatIn (HsInt _)) = True
- valid_neg_pat (LitPatIn (HsFrac _)) = True
- valid_neg_pat _ = False
+ = rnPat pat `thenRn` \ (pat', fvs) ->
+ lookupBndrRn name `thenRn` \ vname ->
+ returnRn (AsPatIn vname pat', fvs)
+
+rnPat (ConPatIn con pats)
+ = lookupOccRn con `thenRn` \ con' ->
+ mapFvRn rnPat pats `thenRn` \ (patslist, fvs) ->
+ returnRn (ConPatIn con' patslist, fvs `addOneFV` con')
+
+rnPat (ConOpPatIn pat1 con _ pat2)
+ = rnPat pat1 `thenRn` \ (pat1', fvs1) ->
+ lookupOccRn con `thenRn` \ con' ->
+ rnPat pat2 `thenRn` \ (pat2', fvs2) ->
+
+ getModeRn `thenRn` \ mode ->
+ -- See comments with rnExpr (OpApp ...)
+ (if isInterfaceMode mode
+ then returnRn (ConOpPatIn pat1' con' defaultFixity pat2')
+ else lookupFixityRn con' `thenRn` \ fixity ->
+ mkConOpPatRn pat1' con' fixity pat2'
+ ) `thenRn` \ pat' ->
+ returnRn (pat', fvs1 `plusFV` fvs2 `addOneFV` con')
rnPat (ParPatIn pat)
- = rnPat pat `thenRn` \ pat' ->
- returnRn (ParPatIn pat')
+ = rnPat pat `thenRn` \ (pat', fvs) ->
+ returnRn (ParPatIn pat', fvs)
rnPat (ListPatIn pats)
- = mapRn rnPat pats `thenRn` \ patslist ->
- returnRn (ListPatIn patslist)
+ = mapFvRn rnPat pats `thenRn` \ (patslist, fvs) ->
+ returnRn (ListPatIn patslist, fvs `addOneFV` listTyCon_name)
-rnPat (TuplePatIn pats)
- = mapRn rnPat pats `thenRn` \ patslist ->
- returnRn (TuplePatIn patslist)
+rnPat (PArrPatIn pats)
+ = mapFvRn rnPat pats `thenRn` \ (patslist, fvs) ->
+ returnRn (PArrPatIn patslist,
+ fvs `plusFV` implicit_fvs `addOneFV` parrTyCon_name)
+ where
+ implicit_fvs = mkFVs [lengthPName, indexPName]
+
+rnPat (TuplePatIn pats boxed)
+ = mapFvRn rnPat pats `thenRn` \ (patslist, fvs) ->
+ returnRn (TuplePatIn patslist boxed, fvs `addOneFV` tycon_name)
+ where
+ tycon_name = tupleTyCon_name boxed (length pats)
rnPat (RecPatIn con rpats)
- = panic "rnPat:RecPatIn"
+ = lookupOccRn con `thenRn` \ con' ->
+ rnRpats rpats `thenRn` \ (rpats', fvs) ->
+ returnRn (RecPatIn con' rpats', fvs `addOneFV` con')
+rnPat (TypePatIn name)
+ = rnHsTypeFVs (text "type pattern") name `thenRn` \ (name', fvs) ->
+ returnRn (TypePatIn name', fvs)
\end{code}
************************************************************************
************************************************************************
\begin{code}
-rnMatch :: RdrNameMatch -> RnM_Fixes s (RenamedMatch, FreeVars)
-
-rnMatch match
- = getSrcLocRn `thenRn` \ src_loc ->
- newLocalNames "variable in pattern"
- (binders `zip` repeat src_loc) `thenRn` \ new_binders ->
- extendSS2 new_binders (rnMatch_aux match)
- where
- binders = collect_binders match
+rnMatch :: HsMatchContext RdrName -> RdrNameMatch -> RnMS (RenamedMatch, FreeVars)
- collect_binders :: RdrNameMatch -> [RdrName]
+rnMatch ctxt match@(Match pats maybe_rhs_sig grhss)
+ = pushSrcLocRn (getMatchLoc match) $
- collect_binders (GRHSMatch _) = []
- collect_binders (PatMatch pat match)
- = collectPatBinders pat ++ collect_binders match
-
-rnMatch_aux (PatMatch pat match)
- = rnPat pat `thenRn` \ pat' ->
- rnMatch_aux match `thenRn` \ (match', fvMatch) ->
- returnRn (PatMatch pat' match', fvMatch)
+ -- Bind pattern-bound type variables
+ let
+ rhs_sig_tys = case maybe_rhs_sig of
+ Nothing -> []
+ Just ty -> [ty]
+ pat_sig_tys = collectSigTysFromPats pats
+ doc_sig = text "In a result type-signature"
+ doc_pat = pprMatchContext ctxt
+ in
+ bindPatSigTyVars (rhs_sig_tys ++ pat_sig_tys) $
+
+ -- Note that we do a single bindLocalsRn for all the
+ -- matches together, so that we spot the repeated variable in
+ -- f x x = 1
+ bindLocalsFVRn doc_pat (collectPatsBinders pats) $ \ new_binders ->
+
+ mapFvRn rnPat pats `thenRn` \ (pats', pat_fvs) ->
+ rnGRHSs grhss `thenRn` \ (grhss', grhss_fvs) ->
+ doptRn Opt_GlasgowExts `thenRn` \ opt_GlasgowExts ->
+ (case maybe_rhs_sig of
+ Nothing -> returnRn (Nothing, emptyFVs)
+ Just ty | opt_GlasgowExts -> rnHsTypeFVs doc_sig ty `thenRn` \ (ty', ty_fvs) ->
+ returnRn (Just ty', ty_fvs)
+ | otherwise -> addErrRn (patSigErr ty) `thenRn_`
+ returnRn (Nothing, emptyFVs)
+ ) `thenRn` \ (maybe_rhs_sig', ty_fvs) ->
-rnMatch_aux (GRHSMatch grhss_and_binds)
- = rnGRHSsAndBinds grhss_and_binds `thenRn` \ (grhss_and_binds', fvs) ->
- returnRn (GRHSMatch grhss_and_binds', fvs)
+ let
+ binder_set = mkNameSet new_binders
+ unused_binders = nameSetToList (binder_set `minusNameSet` grhss_fvs)
+ all_fvs = grhss_fvs `plusFV` pat_fvs `plusFV` ty_fvs
+ in
+ warnUnusedMatches unused_binders `thenRn_`
+
+ returnRn (Match pats' maybe_rhs_sig' grhss', all_fvs)
+ -- The bindLocals and bindTyVars will remove the bound FVs
\end{code}
+
%************************************************************************
%* *
-\subsubsection{Guarded right-hand sides (GRHSsAndBinds)}
+\subsubsection{Guarded right-hand sides (GRHSs)}
%* *
%************************************************************************
\begin{code}
-rnGRHSsAndBinds :: RdrNameGRHSsAndBinds -> RnM_Fixes s (RenamedGRHSsAndBinds, FreeVars)
-
-rnGRHSsAndBinds (GRHSsAndBindsIn grhss binds)
- = rnBinds binds `thenRn` \ (binds', fvBinds, scope) ->
- extendSS2 scope (rnGRHSs grhss) `thenRn` \ (grhss', fvGRHS) ->
- returnRn (GRHSsAndBindsIn grhss' binds', fvBinds `unionUniqSets` fvGRHS)
+rnGRHSs :: RdrNameGRHSs -> RnMS (RenamedGRHSs, FreeVars)
+
+rnGRHSs (GRHSs grhss binds _)
+ = rnBinds binds $ \ binds' ->
+ mapFvRn rnGRHS grhss `thenRn` \ (grhss', fvGRHSs) ->
+ returnRn (GRHSs grhss' binds' placeHolderType, fvGRHSs)
+
+rnGRHS (GRHS guarded locn)
+ = doptRn Opt_GlasgowExts `thenRn` \ opt_GlasgowExts ->
+ pushSrcLocRn locn $
+ (if not (opt_GlasgowExts || is_standard_guard guarded) then
+ addWarnRn (nonStdGuardErr guarded)
+ else
+ returnRn ()
+ ) `thenRn_`
+
+ rnStmts guarded `thenRn` \ ((_, guarded'), fvs) ->
+ returnRn (GRHS guarded' locn, fvs)
where
- rnGRHSs [] = returnRn ([], emptyUniqSet)
-
- rnGRHSs (grhs:grhss)
- = rnGRHS grhs `thenRn` \ (grhs', fvs) ->
- rnGRHSs grhss `thenRn` \ (grhss', fvss) ->
- returnRn (grhs' : grhss', fvs `unionUniqSets` fvss)
-
- rnGRHS (GRHS guard expr locn)
- = pushSrcLocRn locn $
- rnExpr guard `thenRn` \ (guard', fvsg) ->
- rnExpr expr `thenRn` \ (expr', fvse) ->
- returnRn (GRHS guard' expr' locn, fvsg `unionUniqSets` fvse)
-
- rnGRHS (OtherwiseGRHS expr locn)
- = pushSrcLocRn locn $
- rnExpr expr `thenRn` \ (expr', fvs) ->
- returnRn (OtherwiseGRHS expr' locn, fvs)
+ -- Standard Haskell 1.4 guards are just a single boolean
+ -- expression, rather than a list of qualifiers as in the
+ -- Glasgow extension
+ is_standard_guard [ResultStmt _ _] = True
+ is_standard_guard [ExprStmt _ _ _, ResultStmt _ _] = True
+ is_standard_guard other = False
\end{code}
%************************************************************************
%************************************************************************
\begin{code}
-rnExprs :: [RdrNameHsExpr] -> RnM_Fixes s ([RenamedHsExpr], FreeVars)
-
-rnExprs [] = returnRn ([], emptyUniqSet)
+rnExprs :: [RdrNameHsExpr] -> RnMS ([RenamedHsExpr], FreeVars)
+rnExprs ls = rnExprs' ls emptyUniqSet
+ where
+ rnExprs' [] acc = returnRn ([], acc)
+ rnExprs' (expr:exprs) acc
+ = rnExpr expr `thenRn` \ (expr', fvExpr) ->
+
+ -- Now we do a "seq" on the free vars because typically it's small
+ -- or empty, especially in very long lists of constants
+ let
+ acc' = acc `plusFV` fvExpr
+ in
+ (grubby_seqNameSet acc' rnExprs') exprs acc' `thenRn` \ (exprs', fvExprs) ->
+ returnRn (expr':exprs', fvExprs)
-rnExprs (expr:exprs)
- = rnExpr expr `thenRn` \ (expr', fvExpr) ->
- rnExprs exprs `thenRn` \ (exprs', fvExprs) ->
- returnRn (expr':exprs', fvExpr `unionUniqSets` fvExprs)
+-- Grubby little function to do "seq" on namesets; replace by proper seq when GHC can do seq
+grubby_seqNameSet ns result | isNullUFM ns = result
+ | otherwise = result
\end{code}
-Variables. We look up the variable and return the resulting name. The
-interesting question is what the free-variable set should be. We
-don't want to return imported or prelude things as free vars. So we
-look at the RnName returned from the lookup, and make it part of the
-free-var set iff if it's a LocallyDefined RnName.
-
-ToDo: what about RnClassOps ???
-\end{itemize}
+Variables. We look up the variable and return the resulting name.
\begin{code}
-rnExpr :: RdrNameHsExpr -> RnM_Fixes s (RenamedHsExpr, FreeVars)
+rnExpr :: RdrNameHsExpr -> RnMS (RenamedHsExpr, FreeVars)
rnExpr (HsVar v)
- = lookupValue v `thenRn` \ vname ->
- returnRn (HsVar vname, fv_set vname)
- where
- fv_set vname@(RnName n)
- | isLocallyDefinedName n = unitUniqSet vname
- fv_set _ = emptyUniqSet
-
-rnExpr (HsLit lit)
- = returnRn (HsLit lit, emptyUniqSet)
+ = lookupOccRn v `thenRn` \ name ->
+ if name `hasKey` assertIdKey then
+ -- We expand it to (GHCerr.assert__ location)
+ mkAssertExpr
+ else
+ -- The normal case
+ returnRn (HsVar name, unitFV name)
+
+rnExpr (HsIPVar v)
+ = newIPName v `thenRn` \ name ->
+ let
+ fvs = case name of
+ Linear _ -> mkFVs [splitName, fstName, sndName]
+ Dupable _ -> emptyFVs
+ in
+ returnRn (HsIPVar name, fvs)
+
+rnExpr (HsLit lit)
+ = litFVs lit `thenRn` \ fvs ->
+ returnRn (HsLit lit, fvs)
+
+rnExpr (HsOverLit lit)
+ = rnOverLit lit `thenRn` \ (lit', fvs) ->
+ returnRn (HsOverLit lit', fvs)
rnExpr (HsLam match)
- = rnMatch match `thenRn` \ (match', fvMatch) ->
+ = rnMatch LambdaExpr match `thenRn` \ (match', fvMatch) ->
returnRn (HsLam match', fvMatch)
rnExpr (HsApp fun arg)
= rnExpr fun `thenRn` \ (fun',fvFun) ->
rnExpr arg `thenRn` \ (arg',fvArg) ->
- returnRn (HsApp fun' arg', fvFun `unionUniqSets` fvArg)
-
-rnExpr (OpApp e1 op e2)
- = rnExpr e1 `thenRn` \ (e1', fvs_e1) ->
- rnExpr op `thenRn` \ (op', fvs_op) ->
- rnExpr e2 `thenRn` \ (e2', fvs_e2) ->
- precParseExpr (OpApp e1' op' e2') `thenRn` \ exp ->
- returnRn (exp, (fvs_op `unionUniqSets` fvs_e1) `unionUniqSets` fvs_e2)
-
-rnExpr (NegApp e)
- = rnExpr e `thenRn` \ (e', fvs_e) ->
- returnRn (NegApp e', fvs_e)
+ returnRn (HsApp fun' arg', fvFun `plusFV` fvArg)
+
+rnExpr (OpApp e1 op _ e2)
+ = rnExpr e1 `thenRn` \ (e1', fv_e1) ->
+ rnExpr e2 `thenRn` \ (e2', fv_e2) ->
+ rnExpr op `thenRn` \ (op'@(HsVar op_name), fv_op) ->
+
+ -- 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 `thenRn` \ mode ->
+ (if isInterfaceMode mode
+ then returnRn (OpApp e1' op' defaultFixity e2')
+ else lookupFixityRn op_name `thenRn` \ fixity ->
+ mkOpAppRn e1' op' fixity e2'
+ ) `thenRn` \ final_e ->
+
+ returnRn (final_e,
+ fv_e1 `plusFV` fv_op `plusFV` fv_e2)
+
+rnExpr (NegApp e _)
+ = rnExpr e `thenRn` \ (e', fv_e) ->
+ lookupSyntaxName negateName `thenRn` \ neg_name ->
+ mkNegAppRn e' neg_name `thenRn` \ final_e ->
+ returnRn (final_e, fv_e `addOneFV` neg_name)
rnExpr (HsPar e)
= rnExpr e `thenRn` \ (e', fvs_e) ->
returnRn (HsPar e', fvs_e)
-rnExpr (SectionL expr op)
- = rnExpr expr `thenRn` \ (expr', fvs_expr) ->
- rnExpr op `thenRn` \ (op', fvs_op) ->
- returnRn (SectionL expr' op', fvs_op `unionUniqSets` fvs_expr)
-
-rnExpr (SectionR op expr)
- = rnExpr op `thenRn` \ (op', fvs_op) ->
- rnExpr expr `thenRn` \ (expr', fvs_expr) ->
- returnRn (SectionR op' expr', fvs_op `unionUniqSets` fvs_expr)
-
-rnExpr (CCall fun args may_gc is_casm fake_result_ty)
- = rnExprs args `thenRn` \ (args', fvs_args) ->
- returnRn (CCall fun args' may_gc is_casm fake_result_ty, fvs_args)
-
-rnExpr (HsSCC label expr)
+rnExpr section@(SectionL expr op)
+ = rnExpr expr `thenRn` \ (expr', fvs_expr) ->
+ rnExpr op `thenRn` \ (op', fvs_op) ->
+ checkSectionPrec InfixL section op' expr' `thenRn_`
+ returnRn (SectionL expr' op', fvs_op `plusFV` fvs_expr)
+
+rnExpr section@(SectionR op expr)
+ = rnExpr op `thenRn` \ (op', fvs_op) ->
+ rnExpr expr `thenRn` \ (expr', fvs_expr) ->
+ checkSectionPrec InfixR section op' expr' `thenRn_`
+ returnRn (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
+ = lookupOrigNames [] `thenRn` \ implicit_fvs ->
+ rnExprs args `thenRn` \ (args', fvs_args) ->
+ returnRn (HsCCall fun args' may_gc is_casm placeHolderType,
+ fvs_args `plusFV` mkFVs [cCallableClassName,
+ cReturnableClassName,
+ ioDataConName])
+
+rnExpr (HsSCC lbl expr)
= rnExpr expr `thenRn` \ (expr', fvs_expr) ->
- returnRn (HsSCC label expr', fvs_expr)
+ returnRn (HsSCC lbl expr', fvs_expr)
rnExpr (HsCase expr ms src_loc)
= pushSrcLocRn src_loc $
- rnExpr expr `thenRn` \ (new_expr, e_fvs) ->
- mapAndUnzipRn rnMatch ms `thenRn` \ (new_ms, ms_fvs) ->
- returnRn (HsCase new_expr new_ms src_loc, unionManyUniqSets (e_fvs : ms_fvs))
+ rnExpr expr `thenRn` \ (new_expr, e_fvs) ->
+ mapFvRn (rnMatch CaseAlt) ms `thenRn` \ (new_ms, ms_fvs) ->
+ returnRn (HsCase new_expr new_ms src_loc, e_fvs `plusFV` ms_fvs)
rnExpr (HsLet binds expr)
- = rnBinds binds `thenRn` \ (binds', fvBinds, new_binders) ->
- extendSS2 new_binders (rnExpr expr) `thenRn` \ (expr',fvExpr) ->
- returnRn (HsLet binds' expr', fvBinds `unionUniqSets` fvExpr)
+ = rnBinds binds $ \ binds' ->
+ rnExpr expr `thenRn` \ (expr',fvExpr) ->
+ returnRn (HsLet binds' expr', fvExpr)
-rnExpr (HsDo stmts src_loc)
- = pushSrcLocRn src_loc $
- rnStmts stmts `thenRn` \ (stmts', fvStmts) ->
- returnRn (HsDo stmts' src_loc, fvStmts)
-
-rnExpr (ListComp expr quals)
- = rnQuals quals `thenRn` \ ((quals', qual_binders), fvQuals) ->
- extendSS2 qual_binders (rnExpr expr) `thenRn` \ (expr', fvExpr) ->
- returnRn (ListComp expr' quals', fvExpr `unionUniqSets` fvQuals)
+rnExpr (HsWith expr binds is_with)
+ = warnCheckRn (not is_with) withWarning `thenRn_`
+ rnExpr expr `thenRn` \ (expr',fvExpr) ->
+ rnIPBinds binds `thenRn` \ (binds',fvBinds) ->
+ returnRn (HsWith expr' binds' is_with, fvExpr `plusFV` fvBinds)
-rnExpr (ExplicitList exps)
- = rnExprs exps `thenRn` \ (exps', fvs) ->
- returnRn (ExplicitList exps', fvs)
+rnExpr e@(HsDo do_or_lc stmts _ ty src_loc)
+ = pushSrcLocRn src_loc $
+ rnStmts stmts `thenRn` \ ((_, stmts'), fvs) ->
+
+ -- Check the statement list ends in an expression
+ case last stmts' of {
+ ResultStmt _ _ -> returnRn () ;
+ _ -> addErrRn (doStmtListErr e)
+ } `thenRn_`
+
+ -- Generate the rebindable syntax for the monad
+ (case do_or_lc of
+ DoExpr -> mapRn lookupSyntaxName monad_names
+ other -> returnRn []
+ ) `thenRn` \ monad_names' ->
+
+ returnRn (HsDo do_or_lc stmts' monad_names' placeHolderType src_loc,
+ fvs `plusFV` implicit_fvs)
+ where
+ monad_names = [returnMName, failMName, bindMName, thenMName]
+
+ implicit_fvs = case do_or_lc of
+ PArrComp -> mkFVs [replicatePName, mapPName, filterPName,
+ falseDataConName, trueDataConName, crossPName,
+ zipPName]
+ _ -> mkFVs [foldrName, buildName, monadClassName]
+ -- Monad stuff should not be necessary for a list comprehension
+ -- but the typechecker looks up the bind and return Ids anyway
+ -- Oh well.
+
+rnExpr (ExplicitList _ exps)
+ = rnExprs exps `thenRn` \ (exps', fvs) ->
+ returnRn (ExplicitList placeHolderType exps', fvs `addOneFV` listTyCon_name)
+
+rnExpr (ExplicitPArr _ exps)
+ = rnExprs exps `thenRn` \ (exps', fvs) ->
+ returnRn (ExplicitPArr placeHolderType exps',
+ fvs `addOneFV` toPName `addOneFV` parrTyCon_name)
+
+rnExpr (ExplicitTuple exps boxity)
+ = rnExprs exps `thenRn` \ (exps', fvs) ->
+ returnRn (ExplicitTuple exps' boxity, fvs `addOneFV` tycon_name)
+ where
+ tycon_name = tupleTyCon_name boxity (length exps)
-rnExpr (ExplicitTuple exps)
- = rnExprs exps `thenRn` \ (exps', fvExps) ->
- returnRn (ExplicitTuple exps', fvExps)
+rnExpr (RecordCon con_id rbinds)
+ = lookupOccRn con_id `thenRn` \ conname ->
+ rnRbinds "construction" rbinds `thenRn` \ (rbinds', fvRbinds) ->
+ returnRn (RecordCon conname rbinds', fvRbinds `addOneFV` conname)
-rnExpr (RecordCon con rbinds)
- = panic "rnExpr:RecordCon"
-rnExpr (RecordUpd exp rbinds)
- = panic "rnExpr:RecordUpd"
+rnExpr (RecordUpd expr rbinds)
+ = rnExpr expr `thenRn` \ (expr', fvExpr) ->
+ rnRbinds "update" rbinds `thenRn` \ (rbinds', fvRbinds) ->
+ returnRn (RecordUpd expr' rbinds', fvExpr `plusFV` fvRbinds)
rnExpr (ExprWithTySig expr pty)
- = rnExpr expr `thenRn` \ (expr', fvExpr) ->
- rnPolyType nullTyVarNamesEnv pty `thenRn` \ pty' ->
- returnRn (ExprWithTySig expr' pty', fvExpr)
+ = rnExpr expr `thenRn` \ (expr', fvExpr) ->
+ rnHsTypeFVs (text "an expression type signature") pty `thenRn` \ (pty', fvTy) ->
+ returnRn (ExprWithTySig expr' pty', fvExpr `plusFV` fvTy)
rnExpr (HsIf p b1 b2 src_loc)
= pushSrcLocRn src_loc $
rnExpr p `thenRn` \ (p', fvP) ->
rnExpr b1 `thenRn` \ (b1', fvB1) ->
rnExpr b2 `thenRn` \ (b2', fvB2) ->
- returnRn (HsIf p' b1' b2' src_loc, unionManyUniqSets [fvP, fvB1, fvB2])
+ returnRn (HsIf p' b1' b2' src_loc, plusFVs [fvP, fvB1, fvB2])
+
+rnExpr (HsType a)
+ = rnHsTypeFVs doc a `thenRn` \ (t, fvT) ->
+ returnRn (HsType t, fvT)
+ where
+ doc = text "in a type argument"
rnExpr (ArithSeqIn seq)
- = rn_seq seq `thenRn` \ (new_seq, fvs) ->
- returnRn (ArithSeqIn new_seq, fvs)
+ = rn_seq seq `thenRn` \ (new_seq, fvs) ->
+ returnRn (ArithSeqIn new_seq, fvs `addOneFV` enumClassName)
where
rn_seq (From expr)
= rnExpr expr `thenRn` \ (expr', fvExpr) ->
rn_seq (FromThen expr1 expr2)
= rnExpr expr1 `thenRn` \ (expr1', fvExpr1) ->
rnExpr expr2 `thenRn` \ (expr2', fvExpr2) ->
- returnRn (FromThen expr1' expr2', fvExpr1 `unionUniqSets` fvExpr2)
+ returnRn (FromThen expr1' expr2', fvExpr1 `plusFV` fvExpr2)
rn_seq (FromTo expr1 expr2)
= rnExpr expr1 `thenRn` \ (expr1', fvExpr1) ->
rnExpr expr2 `thenRn` \ (expr2', fvExpr2) ->
- returnRn (FromTo expr1' expr2', fvExpr1 `unionUniqSets` fvExpr2)
+ returnRn (FromTo expr1' expr2', fvExpr1 `plusFV` fvExpr2)
rn_seq (FromThenTo expr1 expr2 expr3)
= rnExpr expr1 `thenRn` \ (expr1', fvExpr1) ->
rnExpr expr2 `thenRn` \ (expr2', fvExpr2) ->
rnExpr expr3 `thenRn` \ (expr3', fvExpr3) ->
returnRn (FromThenTo expr1' expr2' expr3',
- unionManyUniqSets [fvExpr1, fvExpr2, fvExpr3])
+ plusFVs [fvExpr1, fvExpr2, fvExpr3])
+
+rnExpr (PArrSeqIn seq)
+ = rn_seq seq `thenRn` \ (new_seq, fvs) ->
+ returnRn (PArrSeqIn new_seq,
+ fvs `plusFV` mkFVs [enumFromToPName, enumFromThenToPName])
+ where
+
+ -- the parser shouldn't generate these two
+ --
+ rn_seq (From _ ) = panic "RnExpr.rnExpr: Infinite parallel array!"
+ rn_seq (FromThen _ _) = panic "RnExpr.rnExpr: Infinite parallel array!"
+
+ rn_seq (FromTo expr1 expr2)
+ = rnExpr expr1 `thenRn` \ (expr1', fvExpr1) ->
+ rnExpr expr2 `thenRn` \ (expr2', fvExpr2) ->
+ returnRn (FromTo expr1' expr2', fvExpr1 `plusFV` fvExpr2)
+ rn_seq (FromThenTo expr1 expr2 expr3)
+ = rnExpr expr1 `thenRn` \ (expr1', fvExpr1) ->
+ rnExpr expr2 `thenRn` \ (expr2', fvExpr2) ->
+ rnExpr expr3 `thenRn` \ (expr3', fvExpr3) ->
+ returnRn (FromThenTo expr1' expr2' expr3',
+ plusFVs [fvExpr1, fvExpr2, fvExpr3])
+\end{code}
+
+These three are pattern syntax appearing in expressions.
+Since all the symbols are reservedops we can simply reject them.
+We return a (bogus) EWildPat in each case.
+
+\begin{code}
+rnExpr e@EWildPat = addErrRn (patSynErr e) `thenRn_`
+ returnRn (EWildPat, emptyFVs)
+
+rnExpr e@(EAsPat _ _) = addErrRn (patSynErr e) `thenRn_`
+ returnRn (EWildPat, emptyFVs)
+rnExpr e@(ELazyPat _) = addErrRn (patSynErr e) `thenRn_`
+ returnRn (EWildPat, emptyFVs)
\end{code}
+
+
%************************************************************************
%* *
-\subsubsection{@Qual@s: in list comprehensions}
+\subsubsection{@Rbinds@s and @Rpats@s: in record expressions}
%* *
%************************************************************************
-Note that although some bound vars may appear in the free var set for
-the first qual, these will eventually be removed by the caller. For
-example, if we have @[p | r <- s, q <- r, p <- q]@, when doing
-@[q <- r, p <- q]@, the free var set for @q <- r@ will
-be @{r}@, and the free var set for the entire Quals will be @{r}@. This
-@r@ will be removed only when we finally return from examining all the
-Quals.
-
\begin{code}
-rnQuals :: [RdrNameQual]
- -> RnM_Fixes s (([RenamedQual], -- renamed qualifiers
- [RnName]), -- qualifiers' binders
- FreeVars) -- free variables
-
-rnQuals [qual] -- must be at least one qual
- = rnQual qual `thenRn` \ ((new_qual, bs), fvs) ->
- returnRn (([new_qual], bs), fvs)
-
-rnQuals (qual: quals)
- = rnQual qual `thenRn` \ ((qual', bs1), fvQuals1) ->
- extendSS2 bs1 (rnQuals quals) `thenRn` \ ((quals', bs2), fvQuals2) ->
- returnRn
- ((qual' : quals', bs2 ++ bs1), -- The ones on the right (bs2) shadow the
- -- ones on the left (bs1)
- fvQuals1 `unionUniqSets` fvQuals2)
-
-rnQual (GeneratorQual pat expr)
- = rnExpr expr `thenRn` \ (expr', fvExpr) ->
- let
- binders = collectPatBinders pat
- in
- getSrcLocRn `thenRn` \ src_loc ->
- newLocalNames "variable in list-comprehension-generator pattern"
- (binders `zip` repeat src_loc) `thenRn` \ new_binders ->
- extendSS new_binders (rnPat pat) `thenRn` \ pat' ->
+rnRbinds str rbinds
+ = mapRn_ field_dup_err dup_fields `thenRn_`
+ mapFvRn rn_rbind rbinds `thenRn` \ (rbinds', fvRbind) ->
+ returnRn (rbinds', fvRbind)
+ where
+ (_, dup_fields) = removeDups compare [ f | (f,_,_) <- rbinds ]
- returnRn ((GeneratorQual pat' expr', new_binders), fvExpr)
+ field_dup_err dups = addErrRn (dupFieldErr str dups)
-rnQual (FilterQual expr)
- = rnExpr expr `thenRn` \ (expr', fvs) ->
- returnRn ((FilterQual expr', []), fvs)
+ rn_rbind (field, expr, pun)
+ = lookupGlobalOccRn field `thenRn` \ fieldname ->
+ rnExpr expr `thenRn` \ (expr', fvExpr) ->
+ returnRn ((fieldname, expr', pun), fvExpr `addOneFV` fieldname)
-rnQual (LetQual binds)
- = rnBinds binds `thenRn` \ (binds', binds_fvs, new_binders) ->
- returnRn ((LetQual binds', new_binders), binds_fvs)
+rnRpats rpats
+ = mapRn_ field_dup_err dup_fields `thenRn_`
+ mapFvRn rn_rpat rpats `thenRn` \ (rpats', fvs) ->
+ returnRn (rpats', fvs)
+ where
+ (_, dup_fields) = removeDups compare [ f | (f,_,_) <- rpats ]
+
+ field_dup_err dups = addErrRn (dupFieldErr "pattern" dups)
+
+ rn_rpat (field, pat, pun)
+ = lookupGlobalOccRn field `thenRn` \ fieldname ->
+ rnPat pat `thenRn` \ (pat', fvs) ->
+ returnRn ((fieldname, pat', pun), fvs `addOneFV` fieldname)
\end{code}
+%************************************************************************
+%* *
+\subsubsection{@rnIPBinds@s: in implicit parameter bindings} *
+%* *
+%************************************************************************
+
+\begin{code}
+rnIPBinds [] = returnRn ([], emptyFVs)
+rnIPBinds ((n, expr) : binds)
+ = newIPName n `thenRn` \ name ->
+ rnExpr expr `thenRn` \ (expr',fvExpr) ->
+ rnIPBinds binds `thenRn` \ (binds',fvBinds) ->
+ returnRn ((name, expr') : binds', fvExpr `plusFV` fvBinds)
+
+\end{code}
%************************************************************************
%* *
%* *
%************************************************************************
+Note that although some bound vars may appear in the free var set for
+the first qual, these will eventually be removed by the caller. For
+example, if we have @[p | r <- s, q <- r, p <- q]@, when doing
+@[q <- r, p <- q]@, the free var set for @q <- r@ will
+be @{r}@, and the free var set for the entire Quals will be @{r}@. This
+@r@ will be removed only when we finally return from examining all the
+Quals.
+
\begin{code}
-rnStmts :: [RdrNameStmt] -> RnM_Fixes s ([RenamedStmt], FreeVars)
+rnStmts :: [RdrNameStmt]
+ -> RnMS (([Name], [RenamedStmt]), FreeVars)
-rnStmts [stmt@(ExprStmt _ _)] -- last stmt must be ExprStmt
- = rnStmt stmt `thenRn` \ ((stmt',[]), fvStmt) ->
- returnRn ([stmt'], fvStmt)
+rnStmts []
+ = returnRn (([], []), emptyFVs)
rnStmts (stmt:stmts)
- = rnStmt stmt `thenRn` \ ((stmt',bs), fvStmt) ->
- extendSS2 bs (rnStmts stmts) `thenRn` \ (stmts', fvStmts) ->
- returnRn (stmt':stmts', fvStmt `unionUniqSets` fvStmts)
-
-
-rnStmt (BindStmt pat expr src_loc)
- = pushSrcLocRn src_loc $
- rnExpr expr `thenRn` \ (expr', fvExpr) ->
- let
- binders = collectPatBinders pat
+ = getLocalNameEnv `thenRn` \ name_env ->
+ rnStmt stmt $ \ stmt' ->
+ rnStmts stmts `thenRn` \ ((binders, stmts'), fvs) ->
+ returnRn ((binders, stmt' : stmts'), fvs)
+
+rnStmt :: RdrNameStmt
+ -> (RenamedStmt -> RnMS (([Name], a), FreeVars))
+ -> RnMS (([Name], a), FreeVars)
+-- The thing list of names returned is the list returned by the
+-- thing_inside, plus the binders of the arguments stmt
+
+-- Because of mutual recursion we have to pass in rnExpr.
+
+rnStmt (ParStmt stmtss) thing_inside
+ = mapFvRn rnStmts stmtss `thenRn` \ (bndrstmtss, fv_stmtss) ->
+ let binderss = map fst bndrstmtss
+ checkBndrs all_bndrs bndrs
+ = checkRn (null (intersectBy eqOcc all_bndrs bndrs)) err `thenRn_`
+ returnRn (bndrs ++ all_bndrs)
+ eqOcc n1 n2 = nameOccName n1 == nameOccName n2
+ err = text "duplicate binding in parallel list comprehension"
in
- newLocalNames "variable in do binding"
- (binders `zip` repeat src_loc) `thenRn` \ new_binders ->
- extendSS new_binders (rnPat pat) `thenRn` \ pat' ->
-
- returnRn ((BindStmt pat' expr' src_loc, new_binders), fvExpr)
+ foldlRn checkBndrs [] binderss `thenRn` \ new_binders ->
+ bindLocalNamesFV new_binders $
+ thing_inside (ParStmtOut bndrstmtss)`thenRn` \ ((rest_bndrs, result), fv_rest) ->
+ returnRn ((new_binders ++ rest_bndrs, result), fv_stmtss `plusFV` fv_rest)
-rnStmt (ExprStmt expr src_loc)
- =
- rnExpr expr `thenRn` \ (expr', fvs) ->
- returnRn ((ExprStmt expr' src_loc, []), fvs)
+rnStmt (BindStmt pat expr src_loc) thing_inside
+ = pushSrcLocRn src_loc $
+ rnExpr expr `thenRn` \ (expr', fv_expr) ->
+ bindPatSigTyVars (collectSigTysFromPat pat) $
+ bindLocalsFVRn doc (collectPatBinders pat) $ \ new_binders ->
+ rnPat pat `thenRn` \ (pat', fv_pat) ->
+ thing_inside (BindStmt pat' expr' src_loc) `thenRn` \ ((rest_binders, result), fvs) ->
+ returnRn ((new_binders ++ rest_binders, result),
+ fv_expr `plusFV` fvs `plusFV` fv_pat)
+ where
+ doc = text "In a pattern in 'do' binding"
-rnStmt (LetStmt binds)
- = rnBinds binds `thenRn` \ (binds', binds_fvs, new_binders) ->
- returnRn ((LetStmt binds', new_binders), binds_fvs)
+rnStmt (ExprStmt expr _ src_loc) thing_inside
+ = pushSrcLocRn src_loc $
+ rnExpr expr `thenRn` \ (expr', fv_expr) ->
+ thing_inside (ExprStmt expr' placeHolderType src_loc) `thenRn` \ (result, fvs) ->
+ returnRn (result, fv_expr `plusFV` fvs)
+rnStmt (ResultStmt expr src_loc) thing_inside
+ = pushSrcLocRn src_loc $
+ rnExpr expr `thenRn` \ (expr', fv_expr) ->
+ thing_inside (ResultStmt expr' src_loc) `thenRn` \ (result, fvs) ->
+ returnRn (result, fv_expr `plusFV` fvs)
+
+rnStmt (LetStmt binds) thing_inside
+ = rnBinds binds $ \ binds' ->
+ let new_binders = collectHsBinders binds' in
+ thing_inside (LetStmt binds') `thenRn` \ ((rest_binders, result), fvs) ->
+ returnRn ((new_binders ++ rest_binders, result), fvs )
\end{code}
%************************************************************************
%* *
%************************************************************************
+@mkOpAppRn@ deals with operator fixities. The argument expressions
+are assumed to be already correctly arranged. It needs the fixities
+recorded in the OpApp nodes, because fixity info applies to the things
+the programmer actually wrote, so you can't find it out from the Name.
+
+Furthermore, the second argument is guaranteed not to be another
+operator application. Why? Because the parser parses all
+operator appications left-associatively, EXCEPT negation, which
+we need to handle specially.
+
\begin{code}
-precParseExpr :: RenamedHsExpr -> RnM_Fixes s RenamedHsExpr
-precParsePat :: RenamedPat -> RnM_Fixes s RenamedPat
-
-precParseExpr exp@(OpApp (NegApp e1) (HsVar op) e2)
- = lookupFixity op `thenRn` \ (op_fix, op_prec) ->
- if 6 < op_prec then
- -- negate precedence 6 wired in
- -- (-x)*y ==> -(x*y)
- precParseExpr (OpApp e1 (HsVar op) e2) `thenRn` \ op_app ->
- returnRn (NegApp op_app)
- else
- returnRn exp
-
-precParseExpr exp@(OpApp (OpApp e11 (HsVar op1) e12) (HsVar op) e2)
- = lookupFixity op `thenRn` \ (op_fix, op_prec) ->
- lookupFixity op1 `thenRn` \ (op1_fix, op1_prec) ->
- case cmp op1_prec op_prec of
- LT_ -> rearrange
- EQ_ -> case (op1_fix, op_fix) of
- (INFIXR, INFIXR) -> rearrange
- (INFIXL, INFIXL) -> returnRn exp
- _ -> getSrcLocRn `thenRn` \ src_loc ->
- failButContinueRn exp
- (precParseErr (op1,op1_fix,op1_prec) (op,op_fix,op_prec) src_loc)
- GT__ -> returnRn exp
+mkOpAppRn :: RenamedHsExpr -- Left operand; already rearranged
+ -> RenamedHsExpr -> Fixity -- Operator and fixity
+ -> RenamedHsExpr -- Right operand (not an OpApp, but might
+ -- be a NegApp)
+ -> RnMS RenamedHsExpr
+
+---------------------------
+-- (e11 `op1` e12) `op2` e2
+mkOpAppRn e1@(OpApp e11 op1 fix1 e12) op2 fix2 e2
+ | nofix_error
+ = addErrRn (precParseErr (ppr_op op1,fix1) (ppr_op op2,fix2)) `thenRn_`
+ returnRn (OpApp e1 op2 fix2 e2)
+
+ | associate_right
+ = mkOpAppRn e12 op2 fix2 e2 `thenRn` \ new_e ->
+ returnRn (OpApp e11 op1 fix1 new_e)
+ where
+ (nofix_error, associate_right) = compareFixity fix1 fix2
+
+---------------------------
+-- (- neg_arg) `op` e2
+mkOpAppRn e1@(NegApp neg_arg neg_name) op2 fix2 e2
+ | nofix_error
+ = addErrRn (precParseErr (pp_prefix_minus,negateFixity) (ppr_op op2,fix2)) `thenRn_`
+ returnRn (OpApp e1 op2 fix2 e2)
+
+ | associate_right
+ = mkOpAppRn neg_arg op2 fix2 e2 `thenRn` \ new_e ->
+ returnRn (NegApp new_e neg_name)
+ where
+ (nofix_error, associate_right) = compareFixity negateFixity fix2
+
+---------------------------
+-- e1 `op` - neg_arg
+mkOpAppRn e1 op1 fix1 e2@(NegApp neg_arg _) -- NegApp can occur on the right
+ | not associate_right -- We *want* right association
+ = addErrRn (precParseErr (ppr_op op1, fix1) (pp_prefix_minus, negateFixity)) `thenRn_`
+ returnRn (OpApp e1 op1 fix1 e2)
where
- rearrange = precParseExpr (OpApp e12 (HsVar op) e2) `thenRn` \ e2' ->
- returnRn (OpApp e11 (HsVar op1) e2')
+ (_, associate_right) = compareFixity fix1 negateFixity
+
+---------------------------
+-- Default case
+mkOpAppRn e1 op fix e2 -- Default case, no rearrangment
+ = ASSERT2( right_op_ok fix e2,
+ ppr e1 $$ text "---" $$ ppr op $$ text "---" $$ ppr fix $$ text "---" $$ ppr e2
+ )
+ returnRn (OpApp e1 op fix e2)
+
+-- Parser left-associates everything, but
+-- derived instances may have correctly-associated things to
+-- in the right operarand. So we just check that the right operand is OK
+right_op_ok fix1 (OpApp _ _ fix2 _)
+ = not error_please && associate_right
+ where
+ (error_please, associate_right) = compareFixity fix1 fix2
+right_op_ok fix1 other
+ = True
-precParseExpr exp = returnRn exp
+-- Parser initially makes negation bind more tightly than any other operator
+mkNegAppRn neg_arg neg_name
+ =
+#ifdef DEBUG
+ getModeRn `thenRn` \ mode ->
+ ASSERT( not_op_app mode neg_arg )
+#endif
+ returnRn (NegApp neg_arg neg_name)
+
+not_op_app SourceMode (OpApp _ _ _ _) = False
+not_op_app mode other = True
+\end{code}
+\begin{code}
+mkConOpPatRn :: RenamedPat -> Name -> Fixity -> RenamedPat
+ -> RnMS RenamedPat
-precParsePat pat@(ConOpPatIn (NegPatIn e1) op e2)
- = lookupFixity op `thenRn` \ (op_fix, op_prec) ->
- if 6 < op_prec then
- -- negate precedence 6 wired in
- getSrcLocRn `thenRn` \ src_loc ->
- failButContinueRn pat (precParseNegPatErr (op,op_fix,op_prec) src_loc)
- else
- returnRn pat
-
-precParsePat pat@(ConOpPatIn (ConOpPatIn p11 op1 p12) op p2)
- = lookupFixity op `thenRn` \ (op_fix, op_prec) ->
- lookupFixity op1 `thenRn` \ (op1_fix, op1_prec) ->
- case cmp op1_prec op_prec of
- LT_ -> rearrange
- EQ_ -> case (op1_fix, op_fix) of
- (INFIXR, INFIXR) -> rearrange
- (INFIXL, INFIXL) -> returnRn pat
- _ -> getSrcLocRn `thenRn` \ src_loc ->
- failButContinueRn pat
- (precParseErr (op1,op1_fix,op1_prec) (op,op_fix,op_prec) src_loc)
- GT__ -> returnRn pat
- where
- rearrange = precParsePat (ConOpPatIn p12 op p2) `thenRn` \ p2' ->
- returnRn (ConOpPatIn p11 op1 p2')
+mkConOpPatRn p1@(ConOpPatIn p11 op1 fix1 p12)
+ op2 fix2 p2
+ | nofix_error
+ = addErrRn (precParseErr (ppr_op op1,fix1) (ppr_op op2,fix2)) `thenRn_`
+ returnRn (ConOpPatIn p1 op2 fix2 p2)
-precParsePat pat = returnRn pat
+ | associate_right
+ = mkConOpPatRn p12 op2 fix2 p2 `thenRn` \ new_p ->
+ returnRn (ConOpPatIn p11 op1 fix1 new_p)
+ where
+ (nofix_error, associate_right) = compareFixity fix1 fix2
-data INFIX = INFIXL | INFIXR | INFIXN deriving Eq
+mkConOpPatRn p1 op fix p2 -- Default case, no rearrangment
+ = ASSERT( not_op_pat p2 )
+ returnRn (ConOpPatIn p1 op fix p2)
-lookupFixity :: RnName -> RnM_Fixes s (INFIX, Int)
-lookupFixity op
- = getExtraRn `thenRn` \ fixity_fm ->
- case lookupUFM fixity_fm op of
- Nothing -> returnRn (INFIXL, 9)
- Just (InfixL _ n) -> returnRn (INFIXL, n)
- Just (InfixR _ n) -> returnRn (INFIXR, n)
- Just (InfixN _ n) -> returnRn (INFIXN, n)
+not_op_pat (ConOpPatIn _ _ _ _) = False
+not_op_pat other = True
\end{code}
\begin{code}
-checkPrecMatch :: Bool -> RnName -> RenamedMatch -> RnM_Fixes s ()
+checkPrecMatch :: Bool -> Name -> RenamedMatch -> RnMS ()
checkPrecMatch False fn match
= returnRn ()
-checkPrecMatch True op (PatMatch p1 (PatMatch p2 (GRHSMatch _)))
- = checkPrec op p1 False `thenRn_`
- checkPrec op p2 True
-checkPrecMatch True op _
- = panic "checkPrecMatch"
-
-checkPrec op (ConOpPatIn _ op1 _) right
- = lookupFixity op `thenRn` \ (op_fix, op_prec) ->
- lookupFixity op1 `thenRn` \ (op1_fix, op1_prec) ->
- getSrcLocRn `thenRn` \ src_loc ->
+
+checkPrecMatch True op (Match (p1:p2:_) _ _)
+ -- True indicates an infix lhs
+ = getModeRn `thenRn` \ mode ->
+ -- See comments with rnExpr (OpApp ...)
+ if isInterfaceMode mode
+ then returnRn ()
+ else checkPrec op p1 False `thenRn_`
+ checkPrec op p2 True
+
+checkPrecMatch True op _ = panic "checkPrecMatch"
+
+checkPrec op (ConOpPatIn _ op1 _ _) right
+ = lookupFixityRn op `thenRn` \ op_fix@(Fixity op_prec op_dir) ->
+ lookupFixityRn op1 `thenRn` \ op1_fix@(Fixity op1_prec op1_dir) ->
let
inf_ok = op1_prec > op_prec ||
(op1_prec == op_prec &&
- (op1_fix == INFIXR && op_fix == INFIXR && right ||
- op1_fix == INFIXL && op_fix == INFIXL && not right))
+ (op1_dir == InfixR && op_dir == InfixR && right ||
+ op1_dir == InfixL && op_dir == InfixL && not right))
- info = (op,op_fix,op_prec)
- info1 = (op1,op1_fix,op1_prec)
+ info = (ppr_op op, op_fix)
+ info1 = (ppr_op op1, op1_fix)
(infol, infor) = if right then (info, info1) else (info1, info)
in
- addErrIfRn (not inf_ok) (precParseErr infol infor src_loc)
-
-checkPrec op (NegPatIn _) right
- = lookupFixity op `thenRn` \ (op_fix, op_prec) ->
- getSrcLocRn `thenRn` \ src_loc ->
- addErrIfRn (6 < op_prec) (precParseNegPatErr (op,op_fix,op_prec) src_loc)
+ checkRn inf_ok (precParseErr infol infor)
checkPrec op pat right
= returnRn ()
+
+-- Check precedence of (arg op) or (op arg) respectively
+-- If arg is itself an operator application, then either
+-- (a) its precedence must be higher than that of op
+-- (b) its precedency & associativity must be the same as that of op
+checkSectionPrec direction section op arg
+ = case arg of
+ OpApp _ op fix _ -> go_for_it (ppr_op op) fix
+ NegApp _ _ -> go_for_it pp_prefix_minus negateFixity
+ other -> returnRn ()
+ where
+ HsVar op_name = op
+ go_for_it pp_arg_op arg_fix@(Fixity arg_prec assoc)
+ = lookupFixityRn op_name `thenRn` \ op_fix@(Fixity op_prec _) ->
+ checkRn (op_prec < arg_prec
+ || op_prec == arg_prec && direction == assoc)
+ (sectionPrecErr (ppr_op op_name, op_fix)
+ (pp_arg_op, arg_fix) section)
\end{code}
+
+%************************************************************************
+%* *
+\subsubsection{Literals}
+%* *
+%************************************************************************
+
+When literals occur we have to make sure
+that the types and classes they involve
+are made available.
+
+\begin{code}
+litFVs (HsChar c)
+ = checkRn (inCharRange c) (bogusCharError c) `thenRn_`
+ returnRn (unitFV charTyCon_name)
+
+litFVs (HsCharPrim c) = returnRn (unitFV (getName charPrimTyCon))
+litFVs (HsString s) = returnRn (mkFVs [listTyCon_name, charTyCon_name])
+litFVs (HsStringPrim s) = returnRn (unitFV (getName addrPrimTyCon))
+litFVs (HsInt i) = returnRn (unitFV (getName intTyCon))
+litFVs (HsIntPrim i) = returnRn (unitFV (getName intPrimTyCon))
+litFVs (HsFloatPrim f) = returnRn (unitFV (getName floatPrimTyCon))
+litFVs (HsDoublePrim d) = returnRn (unitFV (getName doublePrimTyCon))
+litFVs (HsLitLit l bogus_ty) = returnRn (unitFV cCallableClassName)
+litFVs lit = pprPanic "RnExpr.litFVs" (ppr lit) -- HsInteger and HsRat only appear
+ -- in post-typechecker translations
+
+rnOverLit (HsIntegral i _)
+ = lookupSyntaxName fromIntegerName `thenRn` \ from_integer_name ->
+ if inIntRange i then
+ returnRn (HsIntegral i from_integer_name, unitFV from_integer_name)
+ else let
+ fvs = mkFVs [plusIntegerName, timesIntegerName]
+ -- Big integer literals are built, using + and *,
+ -- out of small integers (DsUtils.mkIntegerLit)
+ -- [NB: plusInteger, timesInteger aren't rebindable...
+ -- they are used to construct the argument to fromInteger,
+ -- which is the rebindable one.]
+ in
+ returnRn (HsIntegral i from_integer_name, fvs `addOneFV` from_integer_name)
+
+rnOverLit (HsFractional i _)
+ = lookupSyntaxName fromRationalName `thenRn` \ from_rat_name ->
+ let
+ fvs = mkFVs [ratioDataConName, plusIntegerName, timesIntegerName]
+ -- We have to make sure that the Ratio type is imported with
+ -- its constructor, because literals of type Ratio t are
+ -- built with that constructor.
+ -- The Rational type is needed too, but that will come in
+ -- when fractionalClass does.
+ -- The plus/times integer operations may be needed to construct the numerator
+ -- and denominator (see DsUtils.mkIntegerLit)
+ in
+ returnRn (HsFractional i from_rat_name, fvs `addOneFV` from_rat_name)
+\end{code}
+
+%************************************************************************
+%* *
+\subsubsection{Assertion utils}
+%* *
+%************************************************************************
+
+\begin{code}
+mkAssertExpr :: RnMS (RenamedHsExpr, FreeVars)
+mkAssertExpr =
+ lookupOrigName assertErr_RDR `thenRn` \ name ->
+ getSrcLocRn `thenRn` \ sloc ->
+
+ -- if we're ignoring asserts, return (\ _ e -> e)
+ -- if not, return (assertError "src-loc")
+
+ if opt_IgnoreAsserts then
+ getUniqRn `thenRn` \ uniq ->
+ let
+ vname = mkSystemName uniq FSLIT("v")
+ expr = HsLam ignorePredMatch
+ loc = nameSrcLoc vname
+ ignorePredMatch = mkSimpleMatch [WildPatIn, VarPatIn vname] (HsVar vname) placeHolderType loc
+ in
+ returnRn (expr, unitFV name)
+ else
+ let
+ expr =
+ HsApp (HsVar name)
+ (HsLit (HsStringPrim (mkFastString (stringToUtf8 (showSDoc (ppr sloc))))))
+ in
+ returnRn (expr, unitFV name)
+\end{code}
+
+%************************************************************************
+%* *
+\subsubsection{Errors}
+%* *
+%************************************************************************
+
\begin{code}
-negPatErr pat src_loc
- = addErrLoc src_loc "prefix `-' not applied to literal in pattern" ( \sty ->
- ppr sty pat)
-
-precParseNegPatErr op src_loc
- = addErrLoc src_loc "precedence parsing error" (\ sty ->
- ppBesides [ppStr "prefix `-' has lower precedence than ", pp_op sty op, ppStr " in pattern"])
-
-precParseErr op1 op2 src_loc
- = addErrLoc src_loc "precedence parsing error" (\ sty ->
- ppBesides [ppStr "cannot mix ", pp_op sty op1, ppStr " and ", pp_op sty op2,
- ppStr " in the same infix expression"])
-
-pp_op sty (op, fix, prec) = ppBesides [pprSym sty op, ppLparen, pp_fix fix, ppSP, ppInt prec, ppRparen]
-pp_fix INFIXL = ppStr "infixl"
-pp_fix INFIXR = ppStr "infixr"
-pp_fix INFIXN = ppStr "infix"
+ppr_op op = quotes (ppr op) -- Here, op can be a Name or a (Var n), where n is a Name
+pp_prefix_minus = ptext SLIT("prefix `-'")
+
+dupFieldErr str (dup:rest)
+ = hsep [ptext SLIT("duplicate field name"),
+ quotes (ppr dup),
+ ptext SLIT("in record"), text str]
+
+nonStdGuardErr guard
+ = hang (ptext
+ SLIT("accepting non-standard pattern guards (-fglasgow-exts to suppress this message)")
+ ) 4 (ppr guard)
+
+patSigErr ty
+ = (ptext SLIT("Illegal signature in pattern:") <+> ppr ty)
+ $$ nest 4 (ptext SLIT("Use -fglasgow-exts to permit it"))
+
+patSynErr e
+ = sep [ptext SLIT("Pattern syntax in expression context:"),
+ nest 4 (ppr e)]
+
+doStmtListErr e
+ = sep [ptext SLIT("`do' statements must end in expression:"),
+ nest 4 (ppr e)]
+
+bogusCharError c
+ = ptext SLIT("character literal out of range: '\\") <> int c <> char '\''
+
+withWarning
+ = sep [quotes (ptext SLIT("with")),
+ ptext SLIT("is deprecated, use"),
+ quotes (ptext SLIT("let")),
+ ptext SLIT("instead")]
\end{code}
projects / ghc-hetmet.git / blobdiff