X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2FdeSugar%2FCheck.lhs;h=3996678b4e32308c18621eaee8fc29744c771fc9;hp=85b8f9ddd9959da94b65f6cbf457b47164bb0754;hb=6a05ec5ef5373f61b7f9f5bdc344483417fa801b;hpb=171d4582f4b9a8e0f11f8738079accbb22bafdcb diff --git a/compiler/deSugar/Check.lhs b/compiler/deSugar/Check.lhs index 85b8f9d..3996678 100644 --- a/compiler/deSugar/Check.lhs +++ b/compiler/deSugar/Check.lhs @@ -1,36 +1,37 @@ % +% (c) The University of Glasgow 2006 % (c) The GRASP/AQUA Project, Glasgow University, 1997-1998 % % Author: Juan J. Quintela -\section{Module @Check@ in @deSugar@} \begin{code} - +{-# OPTIONS -w #-} +-- The above warning supression flag is a temporary kludge. +-- While working on this module you are encouraged to remove it and fix +-- any warnings in the module. See +-- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings +-- for details module Check ( check , ExhaustivePat ) where +#include "HsVersions.h" import HsSyn -import TcHsSyn ( hsLPatType, mkVanillaTuplePat ) -import TcType ( tcTyConAppTyCon ) -import DsUtils ( EquationInfo(..), MatchResult(..), - CanItFail(..), firstPat ) -import MatchLit ( tidyLitPat, tidyNPat ) -import Id ( Id, idType ) -import DataCon ( DataCon, dataConTyCon, dataConOrigArgTys, dataConFieldLabels ) -import Name ( Name, mkInternalName, getOccName, isDataSymOcc, - getName, mkVarOccFS ) +import TcHsSyn +import DsUtils +import MatchLit +import Id +import DataCon +import Name import TysWiredIn -import PrelNames ( unboundKey ) -import TyCon ( tyConDataCons, tupleTyConBoxity, isTupleTyCon ) -import BasicTypes ( Boxity(..) ) -import SrcLoc ( noSrcLoc, Located(..), unLoc, noLoc ) +import PrelNames +import TyCon +import BasicTypes +import SrcLoc import UniqSet -import Util ( takeList, splitAtList, notNull ) +import Util import Outputable import FastString - -#include "HsVersions.h" \end{code} This module performs checks about if one list of equations are: @@ -151,7 +152,9 @@ untidy b (L loc p) = L loc (untidy' b p) untidy_con (PrefixCon pats) = PrefixCon (map untidy_pars pats) untidy_con (InfixCon p1 p2) = InfixCon (untidy_pars p1) (untidy_pars p2) -untidy_con (RecCon bs) = RecCon [(f,untidy_pars p) | (f,p) <- bs] +untidy_con (RecCon (HsRecFields flds dd)) + = RecCon (HsRecFields [ fld { hsRecFieldArg = untidy_pars (hsRecFieldArg fld) } + | fld <- flds ] dd) pars :: NeedPars -> WarningPat -> Pat Name pars True p = ParPat p @@ -213,7 +216,9 @@ check' qs | literals = split_by_literals qs | constructors = split_by_constructor qs | only_vars = first_column_only_vars qs - | otherwise = pprPanic "Check.check': Not implemented :-(" (ppr first_pats) +-- FIXME: hack to get view patterns through for now + | otherwise = ([([],[])],emptyUniqSet) +-- pprPanic "Check.check': Not implemented :-(" (ppr first_pats) where -- Note: RecPats will have been simplified to ConPats -- at this stage. @@ -254,7 +259,7 @@ must be one Variable to be complete. process_literals :: [HsLit] -> [(EqnNo, EquationInfo)] -> ([ExhaustivePat],EqnSet) process_literals used_lits qs - | null default_eqns = ([make_row_vars used_lits (head qs)] ++ pats,indexs) + | null default_eqns = ASSERT( not (null qs) ) ([make_row_vars used_lits (head qs)] ++ pats,indexs) | otherwise = (pats_default,indexs_default) where (pats,indexs) = process_explicit_literals used_lits qs @@ -336,7 +341,7 @@ need_default_case used_cons unused_cons qs (pats',indexs') = check' default_eqns pats_default = [(make_whole_con c:ps,constraints) | c <- unused_cons, (ps,constraints) <- pats'] ++ pats - new_wilds = make_row_vars_for_constructor (head qs) + new_wilds = ASSERT( not (null qs) ) make_row_vars_for_constructor (head qs) pats_default_no_eqns = [(make_whole_con c:new_wilds,[]) | c <- unused_cons] ++ pats indexs_default = unionUniqSets indexs' indexs @@ -384,7 +389,7 @@ make_row_vars used_lits (_, EqnInfo { eqn_pats = pats}) hash_x = mkInternalName unboundKey {- doesn't matter much -} (mkVarOccFS FSLIT("#x")) - noSrcLoc + noSrcSpan make_row_vars_for_constructor :: (EqnNo, EquationInfo) -> [WarningPat] make_row_vars_for_constructor (_, EqnInfo { eqn_pats = pats}) @@ -427,8 +432,9 @@ get_lit :: Pat id -> Maybe HsLit -- It doesn't matter which one, because they will only be compared -- with other HsLits gotten in the same way get_lit (LitPat lit) = Just lit -get_lit (NPat (HsIntegral i _) mb _ _) = Just (HsIntPrim (mb_neg mb i)) -get_lit (NPat (HsFractional f _) mb _ _) = Just (HsFloatPrim (mb_neg mb f)) +get_lit (NPat (HsIntegral i _ _) mb _) = Just (HsIntPrim (mb_neg mb i)) +get_lit (NPat (HsFractional f _ _) mb _) = Just (HsFloatPrim (mb_neg mb f)) +get_lit (NPat (HsIsString s _ _) _ _) = Just (HsStringPrim s) get_lit other_pat = Nothing mb_neg :: Num a => Maybe b -> a -> a @@ -436,7 +442,7 @@ mb_neg Nothing v = v mb_neg (Just _) v = -v get_unused_cons :: [Pat Id] -> [DataCon] -get_unused_cons used_cons = unused_cons +get_unused_cons used_cons = ASSERT( not (null used_cons) ) unused_cons where (ConPatOut { pat_con = l_con, pat_ty = ty }) = head used_cons ty_con = dataConTyCon (unLoc l_con) -- Newtype observable @@ -480,7 +486,7 @@ is_con _ = False is_lit :: Pat Id -> Bool is_lit (LitPat _) = True -is_lit (NPat _ _ _ _) = True +is_lit (NPat _ _ _) = True is_lit _ = False is_var :: Pat Id -> Bool @@ -606,14 +612,15 @@ has_nplusk_pat :: Pat Id -> Bool has_nplusk_pat (NPlusKPat _ _ _ _) = True has_nplusk_pat (ParPat p) = has_nplusk_lpat p has_nplusk_pat (AsPat _ p) = has_nplusk_lpat p +has_nplusk_pat (ViewPat _ p _) = has_nplusk_lpat p has_nplusk_pat (SigPatOut p _ ) = has_nplusk_lpat p has_nplusk_pat (ListPat ps _) = any has_nplusk_lpat ps has_nplusk_pat (TuplePat ps _ _) = any has_nplusk_lpat ps has_nplusk_pat (PArrPat ps _) = any has_nplusk_lpat ps has_nplusk_pat (LazyPat p) = False -- Why? has_nplusk_pat (BangPat p) = has_nplusk_lpat p -- I think -has_nplusk_pat (ConPatOut { pat_args = ps }) = any has_nplusk_lpat (hsConArgs ps) -has_nplusk_pat p = False -- VarPat, VarPatOut, WildPat, LitPat, NPat, TypePat, DictPat +has_nplusk_pat (ConPatOut { pat_args = ps }) = any has_nplusk_lpat (hsConPatArgs ps) +has_nplusk_pat p = False -- VarPat, VarPatOut, WildPat, LitPat, NPat, TypePat simplify_lpat :: LPat Id -> LPat Id simplify_lpat p = fmap simplify_pat p @@ -627,6 +634,9 @@ simplify_pat (LazyPat p) = WildPat (hsLPatType p) -- For overlap and exhaus -- purposes, a ~pat is like a wildcard simplify_pat (BangPat p) = unLoc (simplify_lpat p) simplify_pat (AsPat id p) = unLoc (simplify_lpat p) + +simplify_pat (ViewPat expr p ty) = ViewPat expr (simplify_lpat p) ty + simplify_pat (SigPatOut p _) = unLoc (simplify_lpat p) -- I'm not sure this is right simplify_pat pat@(ConPatOut { pat_con = L loc id, pat_args = ps }) @@ -661,33 +671,24 @@ simplify_pat pat@(LitPat (HsString s)) = mk_char_lit c = mkPrefixConPat charDataCon [nlLitPat (HsCharPrim c)] charTy simplify_pat (LitPat lit) = tidyLitPat lit -simplify_pat (NPat lit mb_neg eq lit_ty) = tidyNPat lit mb_neg eq lit_ty +simplify_pat (NPat lit mb_neg eq) = tidyNPat lit mb_neg eq simplify_pat (NPlusKPat id hslit hsexpr1 hsexpr2) = WildPat (idType (unLoc id)) -simplify_pat (DictPat dicts methods) - = case num_of_d_and_ms of - 0 -> simplify_pat (TuplePat [] Boxed unitTy) - 1 -> simplify_pat (head dict_and_method_pats) - _ -> simplify_pat (mkVanillaTuplePat (map noLoc dict_and_method_pats) Boxed) - where - num_of_d_and_ms = length dicts + length methods - dict_and_method_pats = map VarPat (dicts ++ methods) - simplify_pat (CoPat co pat ty) = simplify_pat pat ----------------- simplify_con con (PrefixCon ps) = PrefixCon (map simplify_lpat ps) simplify_con con (InfixCon p1 p2) = PrefixCon [simplify_lpat p1, simplify_lpat p2] -simplify_con con (RecCon fs) +simplify_con con (RecCon (HsRecFields fs _)) | null fs = PrefixCon [nlWildPat | t <- dataConOrigArgTys con] -- Special case for null patterns; maybe not a record at all | otherwise = PrefixCon (map (simplify_lpat.snd) all_pats) where -- pad out all the missing fields with WildPats. field_pats = map (\ f -> (f, nlWildPat)) (dataConFieldLabels con) - all_pats = foldr (\ (id,p) acc -> insertNm (getName (unLoc id)) p acc) + all_pats = foldr (\(HsRecField id p _) acc -> insertNm (getName (unLoc id)) p acc) field_pats fs insertNm nm p [] = [(nm,p)]