2 {-# OPTIONS -Wwarn -w -XNoMonomorphismRestriction #-}
3 -- The NoMonomorphismRestriction deals with a Happy infelicity
4 -- With OutsideIn's more conservativ monomorphism restriction
5 -- we aren't generalising
6 -- notHappyAtAll = error "urk"
7 -- which is terrible. Switching off the restriction allows
8 -- the generalisation. Better would be to make Happy generate
9 -- an appropriate signature.
11 -- The above warning supression flag is a temporary kludge.
12 -- While working on this module you are encouraged to remove it and fix
13 -- any warnings in the module. See
14 -- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
17 module ParserCore ( parseCore ) where
26 liftedTypeKindTyCon, openTypeKindTyCon, unliftedTypeKindTyCon,
27 argTypeKindTyCon, ubxTupleKindTyCon, mkTyConApp
29 import Coercion( mkArrowKind )
30 import Name( Name, nameOccName, nameModule, mkExternalName )
32 import ParserCoreUtils
36 import TysPrim( wordPrimTyCon, intPrimTyCon, charPrimTyCon,
37 floatPrimTyCon, doublePrimTyCon, addrPrimTyCon )
38 import TyCon ( TyCon, tyConName )
44 #include "../HsVersions.h"
53 '%module' { TKmodule }
55 '%newtype' { TKnewtype }
56 '%forall' { TKforall }
64 '%external' { TKexternal }
75 ':=:' { TKcoloneqcolon }
85 INTEGER { TKinteger $$ }
86 RATIONAL { TKrational $$ }
87 STRING { TKstring $$ }
90 %monad { P } { thenP } { returnP }
91 %lexer { lexer } { TKEOF }
95 module :: { HsExtCore RdrName }
96 -- : '%module' modid tdefs vdefgs { HsExtCore $2 $3 $4 }
97 : '%module' modid tdefs vdefgs { HsExtCore $2 [] [] }
100 -------------------------------------------------------------
101 -- Names: the trickiest bit in here
103 -- A name of the form A.B.C could be:
105 -- dcon C in module A.B
106 -- tcon C in module A.B
108 : NAME ':' mparts { undefined }
110 q_dc_name :: { Name }
111 : NAME ':' mparts { undefined }
113 q_tc_name :: { Name }
114 : NAME ':' mparts { undefined }
116 q_var_occ :: { Name }
117 : NAME ':' vparts { undefined }
119 mparts :: { [String] }
121 | CNAME '.' mparts { $1:$3 }
123 vparts :: { [String] }
125 | CNAME '.' vparts { $1:$3 }
127 -------------------------------------------------------------
128 -- Type and newtype declarations are in HsSyn syntax
130 tdefs :: { [TyClDecl RdrName] }
134 tdef :: { TyClDecl RdrName }
135 : '%data' q_tc_name tv_bndrs '=' '{' cons '}' ';'
136 { TyData { tcdND = DataType, tcdCtxt = noLoc []
137 , tcdLName = noLoc (ifaceExtRdrName $2)
138 , tcdTyVars = map toHsTvBndr $3
139 , tcdTyPats = Nothing, tcdKindSig = Nothing
140 , tcdCons = $6, tcdDerivs = Nothing } }
141 | '%newtype' q_tc_name tv_bndrs trep ';'
142 { let tc_rdr = ifaceExtRdrName $2 in
143 TyData { tcdND = NewType, tcdCtxt = noLoc []
144 , tcdLName = noLoc tc_rdr
145 , tcdTyVars = map toHsTvBndr $3
146 , tcdTyPats = Nothing, tcdKindSig = Nothing
147 , tcdCons = $4 (rdrNameOcc tc_rdr), tcdDerivs = Nothing } }
149 -- For a newtype we have to invent a fake data constructor name
150 -- It doesn't matter what it is, because it won't be used
151 trep :: { OccName -> [LConDecl RdrName] }
152 : {- empty -} { (\ tc_occ -> []) }
153 | '=' ty { (\ tc_occ -> let { dc_name = mkRdrUnqual (setOccNameSpace dataName tc_occ) ;
154 con_info = PrefixCon [toHsType $2] }
155 in [noLoc $ mkSimpleConDecl (noLoc dc_name) []
156 (noLoc []) con_info]) }
158 cons :: { [LConDecl RdrName] }
159 : {- empty -} { [] } -- 20060420 Empty data types allowed. jds
161 | con ';' cons { $1:$3 }
163 con :: { LConDecl RdrName }
164 : d_pat_occ attv_bndrs hs_atys
165 { noLoc $ mkSimpleConDecl (noLoc (mkRdrUnqual $1)) $2 (noLoc []) (PrefixCon $3) }
166 -- ToDo: parse record-style declarations
168 attv_bndrs :: { [LHsTyVarBndr RdrName] }
170 | '@' tv_bndr attv_bndrs { toHsTvBndr $2 : $3 }
172 hs_atys :: { [LHsType RdrName] }
173 : atys { map toHsType $1 }
176 ---------------------------------------
178 ---------------------------------------
180 atys :: { [IfaceType] }
185 : fs_var_occ { IfaceTyVar $1 }
186 | q_tc_name { IfaceTyConApp (IfaceTc $1) [] }
190 : fs_var_occ atys { foldl IfaceAppTy (IfaceTyVar $1) $2 }
191 | q_var_occ atys { undefined }
192 | q_tc_name atys { IfaceTyConApp (IfaceTc $1) $2 }
197 | bty '->' ty { IfaceFunTy $1 $3 }
198 | '%forall' tv_bndrs '.' ty { foldr IfaceForAllTy $4 $2 }
200 ----------------------------------------------
201 -- Bindings are in Iface syntax
203 vdefgs :: { [IfaceBinding] }
205 | let_bind ';' vdefgs { $1 : $3 }
207 let_bind :: { IfaceBinding }
208 : '%rec' '{' vdefs1 '}' { IfaceRec $3 } -- Can be empty. Do we care?
209 | vdef { let (b,r) = $1
212 vdefs1 :: { [(IfaceLetBndr, IfaceExpr)] }
214 | vdef ';' vdefs1 { $1:$3 }
216 vdef :: { (IfaceLetBndr, IfaceExpr) }
217 : fs_var_occ '::' ty '=' exp { (IfLetBndr $1 $3 NoInfo, $5) }
218 | '%local' vdef { $2 }
220 -- NB: qd_occ includes data constructors, because
221 -- we allow data-constructor wrappers at top level
222 -- But we discard the module name, because it must be the
223 -- same as the module being compiled, and Iface syntax only
224 -- has OccNames in binding positions. Ah, but it has Names now!
226 ---------------------------------------
228 bndr :: { IfaceBndr }
229 : '@' tv_bndr { IfaceTvBndr $2 }
230 | id_bndr { IfaceIdBndr $1 }
232 bndrs :: { [IfaceBndr] }
234 | bndr bndrs { $1:$2 }
236 id_bndr :: { IfaceIdBndr }
237 : '(' fs_var_occ '::' ty ')' { ($2,$4) }
239 tv_bndr :: { IfaceTvBndr }
240 : fs_var_occ { ($1, ifaceLiftedTypeKind) }
241 | '(' fs_var_occ '::' akind ')' { ($2, $4) }
243 tv_bndrs :: { [IfaceTvBndr] }
245 | tv_bndr tv_bndrs { $1:$2 }
247 akind :: { IfaceKind }
248 : '*' { ifaceLiftedTypeKind }
249 | '#' { ifaceUnliftedTypeKind }
250 | '?' { ifaceOpenTypeKind }
251 | '(' kind ')' { $2 }
253 kind :: { IfaceKind }
255 | akind '->' kind { ifaceArrow $1 $3 }
256 | ty ':=:' ty { ifaceEq $1 $3 }
258 -----------------------------------------
261 aexp :: { IfaceExpr }
262 : fs_var_occ { IfaceLcl $1 }
263 | q_var_occ { IfaceExt $1 }
264 | q_dc_name { IfaceExt $1 }
265 | lit { IfaceLit $1 }
268 fexp :: { IfaceExpr }
269 : fexp aexp { IfaceApp $1 $2 }
270 | fexp '@' aty { IfaceApp $1 (IfaceType $3) }
275 | '\\' bndrs '->' exp { foldr IfaceLam $4 $2 }
276 | '%let' let_bind '%in' exp { IfaceLet $2 $4 }
278 | '%case' '(' ty ')' aexp '%of' id_bndr
279 '{' alts1 '}' { IfaceCase $5 (fst $7) $3 $9 }
280 | '%cast' aexp aty { IfaceCast $2 $3 }
281 -- No InlineMe any more
282 -- | '%note' STRING exp
284 -- --"SCC" -> IfaceNote (IfaceSCC "scc") $3
285 -- "InlineMe" -> IfaceNote IfaceInlineMe $3
287 | '%external' STRING aty { IfaceFCall (ForeignCall.CCall
288 (CCallSpec (StaticTarget (mkFastString $2) Nothing)
289 CCallConv (PlaySafe False)))
292 alts1 :: { [IfaceAlt] }
294 | alt ';' alts1 { $1:$3 }
297 : q_dc_name bndrs '->' exp
298 { (IfaceDataAlt $1, map ifaceBndrName $2, $4) }
299 -- The external syntax currently includes the types of the
300 -- the args, but they aren't needed internally
301 -- Nor is the module qualifier
303 { (IfaceDataAlt $1, [], $3) }
305 { (IfaceLitAlt $1, [], $3) }
307 { (IfaceDefault, [], $3) }
310 : '(' INTEGER '::' aty ')' { convIntLit $2 $4 }
311 | '(' RATIONAL '::' aty ')' { convRatLit $2 $4 }
312 | '(' CHAR '::' aty ')' { MachChar $2 }
313 | '(' STRING '::' aty ')' { MachStr (mkFastString $2) }
315 fs_var_occ :: { FastString }
316 : NAME { mkFastString $1 }
318 var_occ :: { String }
322 -- Data constructor in a pattern or data type declaration; use the dataName,
323 -- because that's what we expect in Core case patterns
324 d_pat_occ :: { OccName }
325 : CNAME { mkOccName dataName $1 }
329 ifaceKind kc = IfaceTyConApp kc []
331 ifaceBndrName (IfaceIdBndr (n,_)) = n
332 ifaceBndrName (IfaceTvBndr (n,_)) = n
334 convIntLit :: Integer -> IfaceType -> Literal
335 convIntLit i (IfaceTyConApp tc [])
336 | tc `eqTc` intPrimTyCon = MachInt i
337 | tc `eqTc` wordPrimTyCon = MachWord i
338 | tc `eqTc` charPrimTyCon = MachChar (chr (fromInteger i))
339 | tc `eqTc` addrPrimTyCon && i == 0 = MachNullAddr
341 = pprPanic "Unknown integer literal type" (ppr aty)
343 convRatLit :: Rational -> IfaceType -> Literal
344 convRatLit r (IfaceTyConApp tc [])
345 | tc `eqTc` floatPrimTyCon = MachFloat r
346 | tc `eqTc` doublePrimTyCon = MachDouble r
348 = pprPanic "Unknown rational literal type" (ppr aty)
350 eqTc :: IfaceTyCon -> TyCon -> Bool -- Ugh!
351 eqTc (IfaceTc name) tycon = name == tyConName tycon
353 -- Tiresomely, we have to generate both HsTypes (in type/class decls)
354 -- and IfaceTypes (in Core expressions). So we parse them as IfaceTypes,
355 -- and convert to HsTypes here. But the IfaceTypes we can see here
356 -- are very limited (see the productions for 'ty', so the translation
358 toHsType :: IfaceType -> LHsType RdrName
359 toHsType (IfaceTyVar v) = noLoc $ HsTyVar (mkRdrUnqual (mkTyVarOccFS v))
360 toHsType (IfaceAppTy t1 t2) = noLoc $ HsAppTy (toHsType t1) (toHsType t2)
361 toHsType (IfaceFunTy t1 t2) = noLoc $ HsFunTy (toHsType t1) (toHsType t2)
362 toHsType (IfaceTyConApp (IfaceTc tc) ts) = foldl mkHsAppTy (noLoc $ HsTyVar (ifaceExtRdrName tc)) (map toHsType ts)
363 toHsType (IfaceForAllTy tv t) = add_forall (toHsTvBndr tv) (toHsType t)
365 -- We also need to convert IfaceKinds to Kinds (now that they are different).
366 -- Only a limited form of kind will be encountered... hopefully
367 toKind :: IfaceKind -> Kind
368 toKind (IfaceFunTy ifK1 ifK2) = mkArrowKind (toKind ifK1) (toKind ifK2)
369 toKind (IfaceTyConApp ifKc []) = mkTyConApp (toKindTc ifKc) []
370 toKind other = pprPanic "toKind" (ppr other)
372 toKindTc :: IfaceTyCon -> TyCon
373 toKindTc IfaceLiftedTypeKindTc = liftedTypeKindTyCon
374 toKindTc IfaceOpenTypeKindTc = openTypeKindTyCon
375 toKindTc IfaceUnliftedTypeKindTc = unliftedTypeKindTyCon
376 toKindTc IfaceUbxTupleKindTc = ubxTupleKindTyCon
377 toKindTc IfaceArgTypeKindTc = argTypeKindTyCon
378 toKindTc other = pprPanic "toKindTc" (ppr other)
380 ifaceTcType ifTc = IfaceTyConApp ifTc []
382 ifaceLiftedTypeKind = ifaceTcType IfaceLiftedTypeKindTc
383 ifaceOpenTypeKind = ifaceTcType IfaceOpenTypeKindTc
384 ifaceUnliftedTypeKind = ifaceTcType IfaceUnliftedTypeKindTc
386 ifaceArrow ifT1 ifT2 = IfaceFunTy ifT1 ifT2
388 ifaceEq ifT1 ifT2 = IfacePredTy (IfaceEqPred ifT1 ifT2)
390 toHsTvBndr :: IfaceTvBndr -> LHsTyVarBndr RdrName
391 toHsTvBndr (tv,k) = noLoc $ KindedTyVar (mkRdrUnqual (mkTyVarOccFS tv)) (toKind k)
393 ifaceExtRdrName :: Name -> RdrName
394 ifaceExtRdrName name = mkOrig (nameModule name) (nameOccName name)
395 ifaceExtRdrName other = pprPanic "ParserCore.ifaceExtRdrName" (ppr other)
397 add_forall tv (L _ (HsForAllTy exp tvs cxt t))
398 = noLoc $ HsForAllTy exp (tv:tvs) cxt t
400 = noLoc $ HsForAllTy Explicit [tv] (noLoc []) t
403 happyError s l = failP (show l ++ ": Parse error\n") (take 100 s) l