X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Ftypecheck%2FTcPat.lhs;h=9a44d8d8713e4ca2882d11be6a72450793150b02;hb=861e836ed0cc1aa45932ecb3470967964440a0ef;hp=25797cab21e45054a3247c91b2215d3cdfebc6d8;hpb=c31358964e3bca4a2b0e8ecdd7856548f1a8ae31;p=ghc-hetmet.git diff --git a/ghc/compiler/typecheck/TcPat.lhs b/ghc/compiler/typecheck/TcPat.lhs index 25797ca..9a44d8d 100644 --- a/ghc/compiler/typecheck/TcPat.lhs +++ b/ghc/compiler/typecheck/TcPat.lhs @@ -4,47 +4,44 @@ \section[TcPat]{Typechecking patterns} \begin{code} -module TcPat ( tcPat, tcPatBndr_NoSigs, badFieldCon, polyPatSig ) where +module TcPat ( tcPat, tcPatBndr_NoSigs, simpleHsLitTy, badFieldCon, polyPatSig ) where #include "HsVersions.h" -import {-# SOURCE #-} TcExpr( tcExpr ) - -import HsSyn ( InPat(..), OutPat(..), HsLit(..), HsExpr(..), Sig(..) ) +import HsSyn ( InPat(..), OutPat(..), HsLit(..), HsOverLit(..), HsExpr(..) ) import RnHsSyn ( RenamedPat ) import TcHsSyn ( TcPat, TcId ) import TcMonad -import Inst ( Inst, OverloadedLit(..), InstOrigin(..), +import Inst ( InstOrigin(..), emptyLIE, plusLIE, LIE, - newMethod, newOverloadedLit, - newDicts, instToIdBndr + newMethod, newOverloadedLit, newDicts, newClassDicts ) import Name ( Name, getOccName, getSrcLoc ) import FieldLabel ( fieldLabelName ) -import TcEnv ( tcLookupValue, +import TcEnv ( tcLookupValue, tcLookupClassByKey, tcLookupValueByKey, newLocalId, badCon ) import TcType ( TcType, TcTyVar, tcInstTyVars, newTyVarTy ) -import TcMonoType ( tcHsType ) -import TcUnify ( unifyTauTy, unifyListTy, - unifyTupleTy, unifyUnboxedTupleTy - ) +import TcMonoType ( tcHsSigType ) +import TcUnify ( unifyTauTy, unifyListTy, unifyTupleTy ) -import Bag ( Bag ) import CmdLineOpts ( opt_IrrefutableTuples ) -import DataCon ( DataCon, dataConSig, dataConFieldLabels, dataConSourceArity ) -import Id ( Id, idType, isDataConId_maybe ) -import Type ( Type, isTauTy, mkTyConApp, boxedTypeKind ) -import Subst ( substTy, substTheta ) +import DataCon ( dataConSig, dataConFieldLabels, + dataConSourceArity + ) +import Id ( isDataConWrapId_maybe ) +import Type ( isTauTy, mkTyConApp, mkClassPred, boxedTypeKind ) +import Subst ( substTy, substClasses ) import TysPrim ( charPrimTy, intPrimTy, floatPrimTy, doublePrimTy, addrPrimTy ) -import TysWiredIn ( charTy, stringTy, intTy ) -import SrcLoc ( SrcLoc ) -import Unique ( eqClassOpKey, geClassOpKey, minusClassOpKey ) +import TysWiredIn ( charTy, stringTy, intTy, integerTy ) +import PrelNames ( eqClassOpKey, geClassOpKey, + cCallableClassKey, eqStringIdKey, + ) +import BasicTypes ( isBoxed ) import Bag -import Util ( zipEqual ) import Outputable \end{code} @@ -125,21 +122,11 @@ tcPat tc_bndr pat_in@(AsPatIn name pat) pat_ty tcPat tc_bndr WildPatIn pat_ty = returnTc (WildPat pat_ty, emptyLIE, emptyBag, emptyBag, emptyLIE) -tcPat tc_bndr (NegPatIn pat) pat_ty - = tcPat tc_bndr (negate_lit pat) pat_ty - where - negate_lit (LitPatIn (HsInt i)) = LitPatIn (HsInt (-i)) - negate_lit (LitPatIn (HsIntPrim i)) = LitPatIn (HsIntPrim (-i)) - negate_lit (LitPatIn (HsFrac f)) = LitPatIn (HsFrac (-f)) - negate_lit (LitPatIn (HsFloatPrim f)) = LitPatIn (HsFloatPrim (-f)) - negate_lit (LitPatIn (HsDoublePrim f)) = LitPatIn (HsDoublePrim (-f)) - negate_lit _ = panic "TcPat:negate_pat" - tcPat tc_bndr (ParPatIn parend_pat) pat_ty = tcPat tc_bndr parend_pat pat_ty tcPat tc_bndr (SigPatIn pat sig) pat_ty - = tcHsType sig `thenTc` \ sig_ty -> + = tcHsSigType sig `thenTc` \ sig_ty -> -- Check that the signature isn't a polymorphic one, which -- we don't permit (at present, anyway) @@ -162,18 +149,15 @@ tcPat tc_bndr pat_in@(ListPatIn pats) pat_ty tcPats tc_bndr pats (repeat elem_ty) `thenTc` \ (pats', lie_req, tvs, ids, lie_avail) -> returnTc (ListPat elem_ty pats', lie_req, tvs, ids, lie_avail) -tcPat tc_bndr pat_in@(TuplePatIn pats boxed) pat_ty +tcPat tc_bndr pat_in@(TuplePatIn pats boxity) pat_ty = tcAddErrCtxt (patCtxt pat_in) $ - (if boxed - then unifyTupleTy arity pat_ty - else unifyUnboxedTupleTy arity pat_ty) `thenTc` \ arg_tys -> - - tcPats tc_bndr pats arg_tys `thenTc` \ (pats', lie_req, tvs, ids, lie_avail) -> + unifyTupleTy boxity arity pat_ty `thenTc` \ arg_tys -> + tcPats tc_bndr pats arg_tys `thenTc` \ (pats', lie_req, tvs, ids, lie_avail) -> -- possibly do the "make all tuple-pats irrefutable" test: let - unmangled_result = TuplePat pats' boxed + unmangled_result = TuplePat pats' boxity -- Under flag control turn a pattern (x,y,z) into ~(x,y,z) -- so that we can experiment with lazy tuple-matching. @@ -181,8 +165,8 @@ tcPat tc_bndr pat_in@(TuplePatIn pats boxed) pat_ty -- it was easy to do. possibly_mangled_result - | opt_IrrefutableTuples && boxed = LazyPat unmangled_result - | otherwise = unmangled_result + | opt_IrrefutableTuples && isBoxed boxity = LazyPat unmangled_result + | otherwise = unmangled_result in returnTc (possibly_mangled_result, lie_req, tvs, ids, lie_avail) where @@ -218,9 +202,11 @@ tcPat tc_bndr pat@(RecPatIn name rpats) pat_ty -- Check the constructor itself tcConstructor pat name pat_ty `thenTc` \ (data_con, ex_tvs, dicts, lie_avail1, arg_tys) -> let - field_tys = zipEqual "tcPat" - (map fieldLabelName (dataConFieldLabels data_con)) - arg_tys + -- Don't use zipEqual! If the constructor isn't really a record, then + -- dataConFieldLabels will be empty (and each field in the pattern + -- will generate an error below). + field_tys = zip (map fieldLabelName (dataConFieldLabels data_con)) + arg_tys in -- Check the fields @@ -271,67 +257,65 @@ tcPat tc_bndr pat@(RecPatIn name rpats) pat_ty %************************************************************************ %* * -\subsection{Non-overloaded literals} +\subsection{Literals} %* * %************************************************************************ \begin{code} -tcPat tc_bndr (LitPatIn lit@(HsChar _)) pat_ty = tcSimpleLitPat lit charTy pat_ty -tcPat tc_bndr (LitPatIn lit@(HsIntPrim _)) pat_ty = tcSimpleLitPat lit intPrimTy pat_ty -tcPat tc_bndr (LitPatIn lit@(HsCharPrim _)) pat_ty = tcSimpleLitPat lit charPrimTy pat_ty -tcPat tc_bndr (LitPatIn lit@(HsStringPrim _)) pat_ty = tcSimpleLitPat lit addrPrimTy pat_ty -tcPat tc_bndr (LitPatIn lit@(HsFloatPrim _)) pat_ty = tcSimpleLitPat lit floatPrimTy pat_ty -tcPat tc_bndr (LitPatIn lit@(HsDoublePrim _)) pat_ty = tcSimpleLitPat lit doublePrimTy pat_ty - -tcPat tc_bndr (LitPatIn lit@(HsLitLit s)) pat_ty = tcSimpleLitPat lit intTy pat_ty - -- This one looks weird! +tcPat tc_bndr (LitPatIn lit@(HsLitLit s _)) pat_ty + -- cf tcExpr on LitLits + = tcLookupClassByKey cCallableClassKey `thenNF_Tc` \ cCallableClass -> + newDicts (LitLitOrigin (_UNPK_ s)) + [mkClassPred cCallableClass [pat_ty]] `thenNF_Tc` \ (dicts, _) -> + returnTc (LitPat (HsLitLit s pat_ty) pat_ty, dicts, emptyBag, emptyBag, emptyLIE) + +tcPat tc_bndr pat@(LitPatIn lit@(HsString _)) pat_ty + = unifyTauTy pat_ty stringTy `thenTc_` + tcLookupValueByKey eqStringIdKey `thenNF_Tc` \ eq_id -> + returnTc (NPat lit stringTy (HsVar eq_id `HsApp` HsLit lit), + emptyLIE, emptyBag, emptyBag, emptyLIE) + +tcPat tc_bndr (LitPatIn simple_lit) pat_ty + = unifyTauTy pat_ty (simpleHsLitTy simple_lit) `thenTc_` + returnTc (LitPat simple_lit pat_ty, emptyLIE, emptyBag, emptyBag, emptyLIE) + +tcPat tc_bndr pat@(NPatIn over_lit) pat_ty + = newOverloadedLit (PatOrigin pat) over_lit pat_ty `thenNF_Tc` \ (over_lit_expr, lie1) -> + tcLookupValueByKey eqClassOpKey `thenNF_Tc` \ eq_sel_id -> + newMethod origin eq_sel_id [pat_ty] `thenNF_Tc` \ (lie2, eq_id) -> + + returnTc (NPat lit' pat_ty (HsApp (HsVar eq_id) over_lit_expr), + lie1 `plusLIE` lie2, + emptyBag, emptyBag, emptyLIE) + where + origin = PatOrigin pat + lit' = case over_lit of + HsIntegral i _ -> HsInteger i + HsFractional f _ -> HsRat f pat_ty \end{code} %************************************************************************ %* * -\subsection{Overloaded patterns: int literals and \tr{n+k} patterns} +\subsection{n+k patterns} %* * %************************************************************************ \begin{code} -tcPat tc_bndr pat@(LitPatIn lit@(HsString str)) pat_ty - = unifyTauTy pat_ty stringTy `thenTc_` - tcLookupValueByKey eqClassOpKey `thenNF_Tc` \ sel_id -> - newMethod (PatOrigin pat) sel_id [stringTy] `thenNF_Tc` \ (lie, eq_id) -> - let - comp_op = HsApp (HsVar eq_id) (HsLitOut lit stringTy) - in - returnTc (NPat lit stringTy comp_op, lie, emptyBag, emptyBag, emptyLIE) - - -tcPat tc_bndr pat@(LitPatIn lit@(HsInt i)) pat_ty - = tcOverloadedLitPat pat lit (OverloadedIntegral i) pat_ty - -tcPat tc_bndr pat@(LitPatIn lit@(HsFrac f)) pat_ty - = tcOverloadedLitPat pat lit (OverloadedFractional f) pat_ty - - -tcPat tc_bndr pat@(NPlusKPatIn name lit@(HsInt i)) pat_ty +tcPat tc_bndr pat@(NPlusKPatIn name lit@(HsIntegral i _) minus) pat_ty = tc_bndr name pat_ty `thenTc` \ bndr_id -> + tcLookupValue minus `thenNF_Tc` \ minus_sel_id -> tcLookupValueByKey geClassOpKey `thenNF_Tc` \ ge_sel_id -> - tcLookupValueByKey minusClassOpKey `thenNF_Tc` \ minus_sel_id -> - - newOverloadedLit origin - (OverloadedIntegral i) pat_ty `thenNF_Tc` \ (over_lit_expr, lie1) -> - + newOverloadedLit origin lit pat_ty `thenNF_Tc` \ (over_lit_expr, lie1) -> newMethod origin ge_sel_id [pat_ty] `thenNF_Tc` \ (lie2, ge_id) -> newMethod origin minus_sel_id [pat_ty] `thenNF_Tc` \ (lie3, minus_id) -> - returnTc (NPlusKPat bndr_id lit pat_ty + returnTc (NPlusKPat bndr_id i pat_ty (SectionR (HsVar ge_id) over_lit_expr) (SectionR (HsVar minus_id) over_lit_expr), lie1 `plusLIE` lie2 `plusLIE` lie3, emptyBag, unitBag (name, bndr_id), emptyLIE) where origin = PatOrigin pat - -tcPat tc_bndr (NPlusKPatIn pat other) pat_ty - = panic "TcPat:NPlusKPat: not an HsInt literal" \end{code} %************************************************************************ @@ -364,50 +348,45 @@ tcPats tc_bndr (ty:tys) (pat:pats) ------------------------------------------------------ \begin{code} -tcSimpleLitPat lit lit_ty pat_ty - = unifyTauTy pat_ty lit_ty `thenTc_` - returnTc (LitPat lit lit_ty, emptyLIE, emptyBag, emptyBag, emptyLIE) - - -tcOverloadedLitPat pat lit over_lit pat_ty - = newOverloadedLit (PatOrigin pat) over_lit pat_ty `thenNF_Tc` \ (over_lit_expr, lie1) -> - tcLookupValueByKey eqClassOpKey `thenNF_Tc` \ eq_sel_id -> - newMethod origin eq_sel_id [pat_ty] `thenNF_Tc` \ (lie2, eq_id) -> - - returnTc (NPat lit pat_ty (HsApp (HsVar eq_id) - over_lit_expr), - lie1 `plusLIE` lie2, - emptyBag, emptyBag, emptyLIE) - where - origin = PatOrigin pat +simpleHsLitTy :: HsLit -> TcType +simpleHsLitTy (HsCharPrim c) = charPrimTy +simpleHsLitTy (HsStringPrim s) = addrPrimTy +simpleHsLitTy (HsInt i) = intTy +simpleHsLitTy (HsInteger i) = integerTy +simpleHsLitTy (HsIntPrim i) = intPrimTy +simpleHsLitTy (HsFloatPrim f) = floatPrimTy +simpleHsLitTy (HsDoublePrim d) = doublePrimTy +simpleHsLitTy (HsChar c) = charTy +simpleHsLitTy (HsString str) = stringTy \end{code} + ------------------------------------------------------ \begin{code} tcConstructor pat con_name pat_ty = -- Check that it's a constructor tcLookupValue con_name `thenNF_Tc` \ con_id -> - case isDataConId_maybe con_id of { + case isDataConWrapId_maybe con_id of { Nothing -> failWithTc (badCon con_id); Just data_con -> -- Instantiate it let - (tvs, theta, ex_tvs, ex_theta, arg_tys, tycon) = dataConSig data_con + (tvs, _, ex_tvs, ex_theta, arg_tys, tycon) = dataConSig data_con -- Ignore the theta; overloaded constructors only -- behave differently when called, not when used for -- matching. in tcInstTyVars (ex_tvs ++ tvs) `thenNF_Tc` \ (all_tvs', ty_args', tenv) -> let - ex_theta' = substTheta tenv ex_theta + ex_theta' = substClasses tenv ex_theta arg_tys' = map (substTy tenv) arg_tys n_ex_tvs = length ex_tvs ex_tvs' = take n_ex_tvs all_tvs' result_ty = mkTyConApp tycon (drop n_ex_tvs ty_args') in - newDicts (PatOrigin pat) ex_theta' `thenNF_Tc` \ (lie_avail, dicts) -> + newClassDicts (PatOrigin pat) ex_theta' `thenNF_Tc` \ (lie_avail, dicts) -> -- Check overall type matches unifyTauTy pat_ty result_ty `thenTc_` @@ -453,14 +432,6 @@ tcConPat tc_bndr pat con_name arg_pats pat_ty patCtxt pat = hang (ptext SLIT("In the pattern:")) 4 (ppr pat) -recordLabel field_label - = hang (hcat [ptext SLIT("When matching record field"), ppr field_label]) - 4 (hcat [ptext SLIT("with its immediately enclosing constructor")]) - -recordRhs field_label pat - = hang (ptext SLIT("In the record field pattern")) - 4 (sep [ppr field_label, char '=', ppr pat]) - badFieldCon :: Name -> Name -> SDoc badFieldCon con field = hsep [ptext SLIT("Constructor") <+> quotes (ppr con), @@ -468,7 +439,7 @@ badFieldCon con field polyPatSig :: TcType -> SDoc polyPatSig sig_ty - = hang (ptext SLIT("Polymorphic type signature in pattern")) + = hang (ptext SLIT("Illegal polymorphic type signature in pattern:")) 4 (ppr sig_ty) \end{code}