CanItFail(..), EquationInfo(..), MatchResult(..),
EqnNo, EqnSet,
+ tidyLitPat,
+
+ mkDsLet, mkDsLets,
+
cantFailMatchResult, extractMatchResult,
combineMatchResults,
adjustMatchResult, adjustMatchResultDs,
mkCoLetsMatchResult, mkGuardedMatchResult,
mkCoPrimCaseMatchResult, mkCoAlgCaseMatchResult,
- mkErrorAppDs,
+ mkErrorAppDs, mkNilExpr, mkConsExpr,
+ mkStringLit, mkStringLitFS,
mkSelectorBinds, mkTupleExpr, mkTupleSelector,
import {-# SOURCE #-} Match ( matchSimply )
-import HsSyn ( OutPat(..) )
+import HsSyn
import TcHsSyn ( TypecheckedPat )
import DsHsSyn ( outPatType, collectTypedPatBinders )
import CoreSyn
import DsMonad
-import CoreUtils ( coreExprType )
-import PrelVals ( iRREFUT_PAT_ERROR_ID )
+import CoreUtils ( exprType, mkIfThenElse )
+import PrelInfo ( iRREFUT_PAT_ERROR_ID )
import Id ( idType, Id, mkWildId )
-import Const ( Literal(..), Con(..) )
+import Literal ( Literal(..) )
import TyCon ( isNewTyCon, tyConDataCons )
-import DataCon ( DataCon, dataConStrictMarks, dataConArgTys )
-import BasicTypes ( StrictnessMark(..) )
+import DataCon ( DataCon, StrictnessMark, maybeMarkedUnboxed,
+ dataConStrictMarks, dataConId, splitProductType_maybe
+ )
import Type ( mkFunTy, isUnLiftedType, splitAlgTyConApp, unUsgTy,
Type
)
-import TysWiredIn ( unitDataCon, tupleCon, stringTy, unitTy, unitDataCon )
+import TysPrim ( intPrimTy,
+ charPrimTy,
+ floatPrimTy,
+ doublePrimTy,
+ addrPrimTy,
+ wordPrimTy
+ )
+import TysWiredIn ( nilDataCon, consDataCon,
+ tupleCon,
+ stringTy,
+ unitDataConId, unitTy,
+ charTy, charDataCon,
+ intTy, intDataCon,
+ floatTy, floatDataCon,
+ doubleTy, doubleDataCon,
+ addrTy, addrDataCon,
+ wordTy, wordDataCon
+ )
+import BasicTypes ( Boxity(..) )
import UniqSet ( mkUniqSet, minusUniqSet, isEmptyUniqSet, UniqSet )
+import Unique ( unpackCStringIdKey, unpackCStringUtf8IdKey )
import Outputable
+import UnicodeUtil ( stringToUtf8 )
+\end{code}
+
+
+
+%************************************************************************
+%* *
+\subsection{Tidying lit pats}
+%* *
+%************************************************************************
+
+\begin{code}
+tidyLitPat lit lit_ty default_pat
+ | lit_ty == charTy = ConPat charDataCon lit_ty [] [] [LitPat (mk_char lit) charPrimTy]
+ | lit_ty == intTy = ConPat intDataCon lit_ty [] [] [LitPat (mk_int lit) intPrimTy]
+ | lit_ty == wordTy = ConPat wordDataCon lit_ty [] [] [LitPat (mk_word lit) wordPrimTy]
+ | lit_ty == addrTy = ConPat addrDataCon lit_ty [] [] [LitPat (mk_addr lit) addrPrimTy]
+ | lit_ty == floatTy = ConPat floatDataCon lit_ty [] [] [LitPat (mk_float lit) floatPrimTy]
+ | lit_ty == doubleTy = ConPat doubleDataCon lit_ty [] [] [LitPat (mk_double lit) doublePrimTy]
+
+ -- Convert literal patterns like "foo" to 'f':'o':'o':[]
+ | str_lit lit = mk_list lit
+
+ | otherwise = default_pat
+
+ where
+ mk_int (HsInt i) = HsIntPrim i
+ mk_int l@(HsLitLit s) = l
+
+ mk_char (HsChar c) = HsCharPrim c
+ mk_char l@(HsLitLit s) = l
+
+ mk_word l@(HsLitLit s) = l
+
+ mk_addr l@(HsLitLit s) = l
+
+ mk_float (HsInt i) = HsFloatPrim (fromInteger i)
+ mk_float (HsFrac f) = HsFloatPrim f
+ mk_float l@(HsLitLit s) = l
+
+ mk_double (HsInt i) = HsDoublePrim (fromInteger i)
+ mk_double (HsFrac f) = HsDoublePrim f
+ mk_double l@(HsLitLit s) = l
+
+ null_str_lit (HsString s) = _NULL_ s
+ null_str_lit other_lit = False
+
+ str_lit (HsString s) = True
+ str_lit _ = False
+
+ mk_list (HsString s) = foldr
+ (\c pat -> ConPat consDataCon lit_ty [] [] [mk_char_lit c,pat])
+ (ConPat nilDataCon lit_ty [] [] []) (_UNPK_INT_ s)
+
+ mk_char_lit c = ConPat charDataCon charTy [] [] [LitPat (HsCharPrim c) charPrimTy]
\end{code}
%************************************************************************
%* *
-%* Selecting match variables
+\subsection{Building lets}
+%* *
+%************************************************************************
+
+Use case, not let for unlifted types. The simplifier will turn some
+back again.
+
+\begin{code}
+mkDsLet :: CoreBind -> CoreExpr -> CoreExpr
+mkDsLet (NonRec bndr rhs) body
+ | isUnLiftedType (idType bndr) = Case rhs bndr [(DEFAULT,[],body)]
+mkDsLet bind body
+ = Let bind body
+
+mkDsLets :: [CoreBind] -> CoreExpr -> CoreExpr
+mkDsLets binds body = foldr mkDsLet body binds
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{ Selecting match variables}
%* *
%************************************************************************
extractMatchResult (MatchResult CanFail match_fn) fail_expr
= mkFailurePair fail_expr `thenDs` \ (fail_bind, if_it_fails) ->
match_fn if_it_fails `thenDs` \ body ->
- returnDs (Let fail_bind body)
+ returnDs (mkDsLet fail_bind body)
combineMatchResults :: MatchResult -> MatchResult -> MatchResult
mkCoLetsMatchResult :: [CoreBind] -> MatchResult -> MatchResult
mkCoLetsMatchResult binds match_result
- = adjustMatchResult (mkLets binds) match_result
+ = adjustMatchResult (mkDsLets binds) match_result
mkGuardedMatchResult :: CoreExpr -> MatchResult -> MatchResult
returnDs (Case (Var var) var (alts ++ [(DEFAULT, [], fail)]))
mk_alt fail (lit, MatchResult _ body_fn) = body_fn fail `thenDs` \ body ->
- returnDs (Literal lit, [], body)
+ returnDs (LitAlt lit, [], body)
mkCoAlgCaseMatchResult :: Id -- Scrutinee
where
-- Common stuff
scrut_ty = idType var
- (tycon, tycon_arg_tys, _) = splitAlgTyConApp scrut_ty
+ (tycon, _, _) = splitAlgTyConApp scrut_ty
-- Stuff for newtype
- (con_id, arg_ids, match_result) = head match_alts
- arg_id = head arg_ids
- coercion_bind = NonRec arg_id (Note (Coerce (idType arg_id) scrut_ty) (Var var))
- newtype_sanity = null (tail match_alts) && null (tail arg_ids)
+ (_, arg_ids, match_result) = head match_alts
+ arg_id = head arg_ids
+ coercion_bind = NonRec arg_id (Note (Coerce (unUsgTy (idType arg_id))
+ (unUsgTy scrut_ty))
+ (Var var))
+ newtype_sanity = null (tail match_alts) && null (tail arg_ids)
-- Stuff for data types
data_cons = tyConDataCons tycon
= body_fn fail `thenDs` \ body ->
rebuildConArgs con args (dataConStrictMarks con) body
`thenDs` \ (body', real_args) ->
- returnDs (DataCon con, real_args, body')
+ returnDs (DataAlt con, real_args, body')
mk_default fail | exhaustive_case = []
| otherwise = [(DEFAULT, [], fail)]
un_mentioned_constructors
= mkUniqSet data_cons `minusUniqSet` mkUniqSet [ con | (con, _, _) <- match_alts]
exhaustive_case = isEmptyUniqSet un_mentioned_constructors
-
--- for each constructor we match on, we might need to re-pack some
--- of the strict fields if they are unpacked in the constructor.
-
+\end{code}
+%
+For each constructor we match on, we might need to re-pack some
+of the strict fields if they are unpacked in the constructor.
+%
+\begin{code}
rebuildConArgs
:: DataCon -- the con we're matching on
-> [Id] -- the source-level args
returnDs (body',arg:args')
rebuildConArgs con (arg:args) (str:stricts) body
= rebuildConArgs con args stricts body `thenDs` \ (body', real_args) ->
- case str of
- MarkedUnboxed pack_con tys ->
- let id_tys = dataConArgTys pack_con ty_args in
- newSysLocalsDs id_tys `thenDs` \ unpacked_args ->
- returnDs (
- Let (NonRec arg (Con (DataCon pack_con)
- (map Type ty_args ++
- map Var unpacked_args))) body',
- unpacked_args ++ real_args
- )
+ case maybeMarkedUnboxed str of
+ Just (pack_con1, _) ->
+ case splitProductType_maybe (idType arg) of
+ Just (_, tycon_args, pack_con, con_arg_tys) ->
+ ASSERT( pack_con == pack_con1 )
+ newSysLocalsDs con_arg_tys `thenDs` \ unpacked_args ->
+ returnDs (
+ mkDsLet (NonRec arg (mkConApp pack_con
+ (map Type tycon_args ++
+ map Var unpacked_args))) body',
+ unpacked_args ++ real_args
+ )
+
_ -> returnDs (body', arg:real_args)
-
- where ty_args = case splitAlgTyConApp (idType arg) of { (_,args,_) -> args }
\end{code}
%************************************************************************
let
full_msg = showSDoc (hcat [ppr src_loc, text "|", text msg])
in
- returnDs (mkApps (Var err_id) [(Type . unUsgTy) ty, mkStringLit full_msg])
+ mkStringLit full_msg `thenDs` \ core_msg ->
+ returnDs (mkApps (Var err_id) [(Type . unUsgTy) ty, core_msg])
-- unUsgTy *required* -- KSW 1999-04-07
+
+mkStringLit :: String -> DsM CoreExpr
+mkStringLit str = mkStringLitFS (_PK_ str)
+
+mkStringLitFS :: FAST_STRING -> DsM CoreExpr
+mkStringLitFS str
+ | all safeChar chars
+ =
+ dsLookupGlobalValue unpackCStringIdKey `thenDs` \ unpack_id ->
+ returnDs (App (Var unpack_id) (Lit (MachStr str)))
+
+ | otherwise
+ =
+ dsLookupGlobalValue unpackCStringUtf8IdKey `thenDs` \ unpack_id ->
+ returnDs (App (Var unpack_id) (Lit (MachStr (_PK_ (stringToUtf8 chars)))))
+
+ where
+ chars = _UNPK_INT_ str
+ safeChar c = c >= 1 && c <= 0xFF
\end{code}
%************************************************************************
This is used in various places to do with lazy patterns.
For each binder $b$ in the pattern, we create a binding:
-
+\begin{verbatim}
b = case v of pat' -> b'
-
-where pat' is pat with each binder b cloned into b'.
+\end{verbatim}
+where @pat'@ is @pat@ with each binder @b@ cloned into @b'@.
ToDo: making these bindings should really depend on whether there's
much work to be done per binding. If the pattern is complex, it
mkSelectorBinds pat val_expr
| length binders == 1 || is_simple_pat pat
- = newSysLocalDs (coreExprType val_expr) `thenDs` \ val_var ->
+ = newSysLocalDs (exprType val_expr) `thenDs` \ val_var ->
-- For the error message we don't use mkErrorAppDs to avoid
-- duplicating the string literal each time
let
full_msg = showSDoc (hcat [ppr src_loc, text "|", ppr pat])
in
+ mkStringLit full_msg `thenDs` \ core_msg ->
mapDs (mk_bind val_var msg_var) binders `thenDs` \ binds ->
returnDs ( (val_var, val_expr) :
- (msg_var, mkStringLit full_msg) :
+ (msg_var, core_msg) :
binds )
| otherwise
- = mkErrorAppDs iRREFUT_PAT_ERROR_ID tuple_ty (showSDoc (ppr pat)) `thenDs` \ error_expr ->
- matchSimply val_expr LetMatch pat local_tuple error_expr `thenDs` \ tuple_expr ->
- newSysLocalDs tuple_ty `thenDs` \ tuple_var ->
+ = mkErrorAppDs iRREFUT_PAT_ERROR_ID tuple_ty (showSDoc (ppr pat))
+ `thenDs` \ error_expr ->
+ matchSimply val_expr LetMatch pat local_tuple error_expr
+ `thenDs` \ tuple_expr ->
+ newSysLocalDs tuple_ty
+ `thenDs` \ tuple_var ->
let
- mk_tup_bind binder = (binder, mkTupleSelector binders binder tuple_var (Var tuple_var))
+ mk_tup_bind binder =
+ (binder, mkTupleSelector binders binder tuple_var (Var tuple_var))
in
returnDs ( (tuple_var, tuple_expr) : map mk_tup_bind binders )
where
binders = collectTypedPatBinders pat
local_tuple = mkTupleExpr binders
- tuple_ty = coreExprType local_tuple
+ tuple_ty = exprType local_tuple
mk_bind scrut_var msg_var bndr_var
-- (mk_bind sv bv) generates
binder_ty = idType bndr_var
error_expr = mkApps (Var iRREFUT_PAT_ERROR_ID) [Type binder_ty, Var msg_var]
- is_simple_pat (TuplePat ps True{-boxed-}) = all is_triv_pat ps
+ is_simple_pat (TuplePat ps Boxed) = all is_triv_pat ps
is_simple_pat (ConPat _ _ _ _ ps) = all is_triv_pat ps
is_simple_pat (VarPat _) = True
is_simple_pat (RecPat _ _ _ _ ps) = and [is_triv_pat p | (_,p,_) <- ps]
\begin{code}
mkTupleExpr :: [Id] -> CoreExpr
-mkTupleExpr [] = mkConApp unitDataCon []
+mkTupleExpr [] = Var unitDataConId
mkTupleExpr [id] = Var id
-mkTupleExpr ids = mkConApp (tupleCon (length ids))
+mkTupleExpr ids = mkConApp (tupleCon Boxed (length ids))
(map (Type . unUsgTy . idType) ids ++ [ Var i | i <- ids ])
\end{code}
just the identity.
\begin{code}
-mkTupleSelector :: [Id] -- The tuple args
- -> Id -- The selected one
- -> Id -- A variable of the same type as the scrutinee
- -> CoreExpr -- Scrutinee
+mkTupleSelector :: [Id] -- The tuple args
+ -> Id -- The selected one
+ -> Id -- A variable of the same type as the scrutinee
+ -> CoreExpr -- Scrutinee
-> CoreExpr
mkTupleSelector [var] should_be_the_same_var scrut_var scrut
mkTupleSelector vars the_var scrut_var scrut
= ASSERT( not (null vars) )
- Case scrut scrut_var [(DataCon (tupleCon (length vars)), vars, Var the_var)]
+ Case scrut scrut_var [(DataAlt (tupleCon Boxed (length vars)), vars, Var the_var)]
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection[mkFailurePair]{Code for pattern-matching and other failures}
+%* *
+%************************************************************************
+
+Call the constructor Ids when building explicit lists, so that they
+interact well with rules.
+
+\begin{code}
+mkNilExpr :: Type -> CoreExpr
+mkNilExpr ty = App (Var (dataConId nilDataCon)) (Type ty)
+
+mkConsExpr :: Type -> CoreExpr -> CoreExpr -> CoreExpr
+mkConsExpr ty hd tl = mkApps (Var (dataConId consDataCon)) [Type ty, hd, tl]
\end{code}
Then
\begin{itemize}
\item
-If the case can't fail, then there'll be no mention of fail.33, and the
+If the case can't fail, then there'll be no mention of @fail.33@, and the
simplifier will later discard it.
\item
\end{itemize}
There's a problem when the result of the case expression is of
-unboxed type. Then the type of fail.33 is unboxed too, and
+unboxed type. Then the type of @fail.33@ is unboxed too, and
there is every chance that someone will change the let into a case:
\begin{verbatim}
case error "Help" of
p4 -> ...
\end{verbatim}
-Now fail.33 is a function, so it can be let-bound.
+Now @fail.33@ is a function, so it can be let-bound.
\begin{code}
mkFailurePair :: CoreExpr -- Result type of the whole case expression
= newFailLocalDs (unitTy `mkFunTy` ty) `thenDs` \ fail_fun_var ->
newSysLocalDs unitTy `thenDs` \ fail_fun_arg ->
returnDs (NonRec fail_fun_var (Lam fail_fun_arg expr),
- App (Var fail_fun_var) (mkConApp unitDataCon []))
+ App (Var fail_fun_var) (Var unitDataConId))
| otherwise
= newFailLocalDs ty `thenDs` \ fail_var ->
returnDs (NonRec fail_var expr, Var fail_var)
where
- ty = coreExprType expr
+ ty = exprType expr
\end{code}
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