CanItFail(..), EquationInfo(..), MatchResult(..),
EqnNo, EqnSet,
+ tidyLitPat, tidyNPat,
+
mkDsLet, mkDsLets,
cantFailMatchResult, extractMatchResult,
mkCoPrimCaseMatchResult, mkCoAlgCaseMatchResult,
mkErrorAppDs, mkNilExpr, mkConsExpr,
+ mkStringLit, mkStringLitFS, mkIntegerLit,
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 CoreUtils ( exprType, mkIfThenElse )
import PrelInfo ( iRREFUT_PAT_ERROR_ID )
import Id ( idType, Id, mkWildId )
-import Const ( Literal(..), Con(..) )
+import Literal ( Literal(..), inIntRange, tARGET_MAX_INT )
import TyCon ( isNewTyCon, tyConDataCons )
-import DataCon ( DataCon, StrictnessMark, maybeMarkedUnboxed, dataConStrictMarks,
- dataConId, splitProductType_maybe
+import DataCon ( DataCon, StrictnessMark, maybeMarkedUnboxed,
+ dataConStrictMarks, dataConId, splitProductType_maybe
)
import Type ( mkFunTy, isUnLiftedType, splitAlgTyConApp, unUsgTy,
Type
)
-import TysWiredIn ( unitDataCon, tupleCon, stringTy, unitTy, unitDataCon,
- nilDataCon, consDataCon
+import TysPrim ( intPrimTy, charPrimTy, floatPrimTy, doublePrimTy )
+import TysWiredIn ( nilDataCon, consDataCon,
+ tupleCon,
+ stringTy,
+ unitDataConId, unitTy,
+ charTy, charDataCon,
+ intTy, intDataCon, smallIntegerDataCon,
+ floatTy, floatDataCon,
+ doubleTy, doubleDataCon,
+ stringTy
)
+import BasicTypes ( Boxity(..) )
import UniqSet ( mkUniqSet, minusUniqSet, isEmptyUniqSet, UniqSet )
+import PrelNames ( unpackCStringName, unpackCStringUtf8Name,
+ plusIntegerName, timesIntegerName )
import Outputable
+import UnicodeUtil ( stringToUtf8 )
\end{code}
+
%************************************************************************
%* *
-\subsection{ Building lets}
+\subsection{Tidying lit pats}
+%* *
+%************************************************************************
+
+\begin{code}
+tidyLitPat :: HsLit -> TypecheckedPat -> TypecheckedPat
+tidyLitPat (HsChar c) pat = ConPat charDataCon charTy [] [] [LitPat (HsCharPrim c) charPrimTy]
+tidyLitPat lit pat = pat
+
+tidyNPat :: HsLit -> Type -> TypecheckedPat -> TypecheckedPat
+tidyNPat (HsString s) _ pat
+ | _LENGTH_ s <= 1 -- Short string literals only
+ = foldr (\c pat -> ConPat consDataCon stringTy [] [] [mk_char_lit c,pat])
+ (ConPat nilDataCon stringTy [] [] []) (_UNPK_INT_ s)
+ -- The stringTy is the type of the whole pattern, not
+ -- the type to instantiate (:) or [] with!
+ where
+ mk_char_lit c = ConPat charDataCon charTy [] [] [LitPat (HsCharPrim c) charPrimTy]
+
+tidyNPat lit lit_ty default_pat
+ | lit_ty == intTy = ConPat intDataCon lit_ty [] [] [LitPat (mk_int lit) intPrimTy]
+ | lit_ty == floatTy = ConPat floatDataCon lit_ty [] [] [LitPat (mk_float lit) floatPrimTy]
+ | lit_ty == doubleTy = ConPat doubleDataCon lit_ty [] [] [LitPat (mk_double lit) doublePrimTy]
+ | otherwise = default_pat
+
+ where
+ mk_int (HsInteger i) = HsIntPrim i
+
+ mk_float (HsInteger i) = HsFloatPrim (fromInteger i)
+ mk_float (HsRat f _) = HsFloatPrim f
+
+ mk_double (HsInteger i) = HsDoublePrim (fromInteger i)
+ mk_double (HsRat f _) = HsDoublePrim f
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Building lets}
%* *
%************************************************************************
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 (unUsgTy (idType arg_id)) (unUsgTy 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)]
ASSERT( pack_con == pack_con1 )
newSysLocalsDs con_arg_tys `thenDs` \ unpacked_args ->
returnDs (
- mkDsLet (NonRec arg (Con (DataCon pack_con)
+ mkDsLet (NonRec arg (mkConApp pack_con
(map Type tycon_args ++
map Var unpacked_args))) body',
unpacked_args ++ real_args
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
\end{code}
+
+*************************************************************
+%* *
+\subsection{Making literals}
+%* *
+%************************************************************************
+
+\begin{code}
+mkIntegerLit :: Integer -> DsM CoreExpr
+mkIntegerLit i
+ | inIntRange i -- Small enough, so start from an Int
+ = returnDs (mkSmallIntegerLit i)
+
+-- Special case for integral literals with a large magnitude:
+-- They are transformed into an expression involving only smaller
+-- integral literals. This improves constant folding.
+
+ | otherwise -- Big, so start from a string
+ = dsLookupGlobalValue plusIntegerName `thenDs` \ plus_id ->
+ dsLookupGlobalValue timesIntegerName `thenDs` \ times_id ->
+ let
+ plus a b = Var plus_id `App` a `App` b
+ times a b = Var times_id `App` a `App` b
+
+ -- Transform i into (x1 + (x2 + (x3 + (...) * b) * b) * b) with abs xi <= b
+ horner :: Integer -> Integer -> CoreExpr
+ horner b i | abs q <= 1 = if r == 0 || r == i
+ then mkSmallIntegerLit i
+ else mkSmallIntegerLit r `plus` mkSmallIntegerLit (i-r)
+ | r == 0 = horner b q `times` mkSmallIntegerLit b
+ | otherwise = mkSmallIntegerLit r `plus` (horner b q `times` mkSmallIntegerLit b)
+ where
+ (q,r) = i `quotRem` b
+
+ in
+ returnDs (horner tARGET_MAX_INT i)
+
+mkSmallIntegerLit i = mkConApp smallIntegerDataCon [mkIntLit i]
+
+mkStringLit :: String -> DsM CoreExpr
+mkStringLit str = mkStringLitFS (_PK_ str)
+
+mkStringLitFS :: FAST_STRING -> DsM CoreExpr
+mkStringLitFS str
+ | _NULL_ str
+ = returnDs (mkNilExpr charTy)
+
+ | _LENGTH_ str == 1
+ = let
+ the_char = mkConApp charDataCon [mkLit (MachChar (_HEAD_INT_ str))]
+ in
+ returnDs (mkConsExpr charTy the_char (mkNilExpr charTy))
+
+ | all safeChar chars
+ = dsLookupGlobalValue unpackCStringName `thenDs` \ unpack_id ->
+ returnDs (App (Var unpack_id) (Lit (MachStr str)))
+
+ | otherwise
+ = dsLookupGlobalValue unpackCStringUtf8Name `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}
+
+
%************************************************************************
%* *
\subsection[mkSelectorBind]{Make a selector bind}
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 )
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}
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}
= 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}
projects / ghc-hetmet.git / blobdiff