2 % (c) The GRASP/AQUA Project, Glasgow University, 1993-1998
4 %************************************************************************
6 \section[HsCore]{Core-syntax unfoldings in Haskell interface files}
8 %************************************************************************
10 We could either use this, or parameterise @GenCoreExpr@ on @Types@ and
11 @TyVars@ as well. Currently trying the former... MEGA SIGH.
15 UfExpr(..), UfAlt, UfBinder(..), UfNote(..),
16 UfBinding(..), UfConAlt(..),
17 HsIdInfo(..), pprHsIdInfo,
19 eq_ufExpr, eq_ufBinders, pprUfExpr, pprHsIdInfo,
21 toUfExpr, toUfBndr, ufBinderName
24 #include "HsVersions.h"
27 import HsTypes ( HsType, pprParendHsType, pprHsTyVarBndr, toHsType,
28 HsTupCon(..), EqHsEnv, hsTupParens,
29 emptyEqHsEnv, extendEqHsEnv, eqListBy,
34 import Id ( idArity, idType, isDataConId_maybe, isFCallId_maybe )
35 import Var ( varType, isId )
36 import IdInfo ( InlinePragInfo, pprInlinePragInfo, ppStrictnessInfo )
37 import Name ( Name, NamedThing(..), getName, toRdrName )
38 import RdrName ( RdrName, rdrNameOcc )
39 import OccName ( isTvOcc )
41 import CostCentre ( pprCostCentreCore )
42 import Demand ( StrictnessInfo )
43 import Literal ( Literal, maybeLitLit )
44 import ForeignCall ( ForeignCall )
45 import DataCon ( dataConTyCon, dataConSourceArity )
46 import TyCon ( isTupleTyCon, tupleTyConBoxity )
47 import Type ( Kind, eqKind )
48 import BasicTypes ( Arity )
49 import FiniteMap ( lookupFM )
54 %************************************************************************
56 \subsection[HsCore-types]{Types for read/written Core unfoldings}
58 %************************************************************************
63 | UfType (HsType name)
64 | UfTuple (HsTupCon name) [UfExpr name] -- Type arguments omitted
65 | UfLam (UfBinder name) (UfExpr name)
66 | UfApp (UfExpr name) (UfExpr name)
67 | UfCase (UfExpr name) name [UfAlt name]
68 | UfLet (UfBinding name) (UfExpr name)
69 | UfNote (UfNote name) (UfExpr name)
71 | UfLitLit FAST_STRING (HsType name)
72 | UfFCall ForeignCall (HsType name)
74 data UfNote name = UfSCC CostCentre
75 | UfCoerce (HsType name)
79 type UfAlt name = (UfConAlt name, [name], UfExpr name)
81 data UfConAlt name = UfDefault
83 | UfTupleAlt (HsTupCon name)
85 | UfLitLitAlt FAST_STRING (HsType name)
88 = UfNonRec (UfBinder name)
90 | UfRec [(UfBinder name, UfExpr name)]
93 = UfValBinder name (HsType name)
94 | UfTyBinder name Kind
96 ufBinderName :: UfBinder name -> name
97 ufBinderName (UfValBinder n _) = n
98 ufBinderName (UfTyBinder n _) = n
102 %************************************************************************
104 \subsection{Converting from Core to UfCore}
106 %************************************************************************
109 toUfExpr :: CoreExpr -> UfExpr Name
110 toUfExpr (Var v) = toUfVar v
111 toUfExpr (Lit l) = case maybeLitLit l of
112 Just (s,ty) -> UfLitLit s (toHsType ty)
114 toUfExpr (Type ty) = UfType (toHsType ty)
115 toUfExpr (Lam x b) = UfLam (toUfBndr x) (toUfExpr b)
116 toUfExpr (App f a) = toUfApp f [a]
117 toUfExpr (Case s x as) = UfCase (toUfExpr s) (getName x) (map toUfAlt as)
118 toUfExpr (Let b e) = UfLet (toUfBind b) (toUfExpr e)
119 toUfExpr (Note n e) = UfNote (toUfNote n) (toUfExpr e)
121 ---------------------
122 toUfNote (SCC cc) = UfSCC cc
123 toUfNote (Coerce t1 _) = UfCoerce (toHsType t1)
124 toUfNote InlineCall = UfInlineCall
125 toUfNote InlineMe = UfInlineMe
127 ---------------------
128 toUfBind (NonRec b r) = UfNonRec (toUfBndr b) (toUfExpr r)
129 toUfBind (Rec prs) = UfRec [(toUfBndr b, toUfExpr r) | (b,r) <- prs]
131 ---------------------
132 toUfAlt (c,bs,r) = (toUfCon c, map getName bs, toUfExpr r)
134 ---------------------
135 toUfCon (DataAlt dc) | isTupleTyCon tc = UfTupleAlt (mk_hs_tup_con tc dc)
136 | otherwise = UfDataAlt (getName dc)
140 toUfCon (LitAlt l) = case maybeLitLit l of
141 Just (s,ty) -> UfLitLitAlt s (toHsType ty)
142 Nothing -> UfLitAlt l
143 toUfCon DEFAULT = UfDefault
145 ---------------------
146 mk_hs_tup_con tc dc = HsTupCon (getName dc) (tupleTyConBoxity tc) (dataConSourceArity dc)
148 ---------------------
149 toUfBndr x | isId x = UfValBinder (getName x) (toHsType (varType x))
150 | otherwise = UfTyBinder (getName x) (varType x)
152 ---------------------
153 toUfApp (App f a) as = toUfApp f (a:as)
155 = case isDataConId_maybe v of
156 -- We convert the *worker* for tuples into UfTuples
157 Just dc | isTupleTyCon tc && saturated
158 -> UfTuple (mk_hs_tup_con tc dc) tup_args
160 val_args = dropWhile isTypeArg as
161 saturated = length val_args == idArity v
162 tup_args = map toUfExpr val_args
166 other -> mkUfApps (toUfVar v) as
168 toUfApp e as = mkUfApps (toUfExpr e) as
170 mkUfApps = foldl (\f a -> UfApp f (toUfExpr a))
172 ---------------------
173 toUfVar v = case isFCallId_maybe v of
174 -- Foreign calls have special syntax
175 Just fcall -> UfFCall fcall (toHsType (idType v))
176 other -> UfVar (getName v)
180 %************************************************************************
182 \subsection[HsCore-print]{Printing Core unfoldings}
184 %************************************************************************
187 instance (NamedThing name, Outputable name) => Outputable (UfExpr name) where
188 ppr e = pprUfExpr noParens e
191 -- Small-hack alert: this instance allows us to do a getOccName on RdrNames.
192 -- Important because we want to pretty-print UfExprs, and we have to
193 -- print an '@' before tyvar-binders in a case alternative.
194 instance NamedThing RdrName where
195 getOccName n = rdrNameOcc n
196 getName n = pprPanic "instance NamedThing RdrName" (ppr n)
198 noParens :: SDoc -> SDoc
201 pprUfExpr :: (NamedThing name, Outputable name) => (SDoc -> SDoc) -> UfExpr name -> SDoc
202 -- The function adds parens in context that need
203 -- an atomic value (e.g. function args)
205 pprUfExpr add_par (UfVar v) = ppr v
206 pprUfExpr add_par (UfLit l) = ppr l
207 pprUfExpr add_par (UfLitLit l ty) = add_par (hsep [ptext SLIT("__litlit"), pprHsString l, pprParendHsType ty])
208 pprUfExpr add_par (UfFCall cc ty) = braces (ppr cc <+> ppr ty)
209 pprUfExpr add_par (UfType ty) = char '@' <+> pprParendHsType ty
211 pprUfExpr add_par e@(UfLam _ _) = add_par (char '\\' <+> hsep (map ppr bndrs)
212 <+> ptext SLIT("->") <+> pprUfExpr noParens body)
213 where (bndrs,body) = collectUfBndrs e
214 pprUfExpr add_par app@(UfApp _ _) = add_par (pprUfApp app)
215 pprUfExpr add_par (UfTuple c as) = hsTupParens c (interpp'SP as)
217 pprUfExpr add_par (UfCase scrut bndr alts)
218 = add_par (hsep [ptext SLIT("case"), pprUfExpr noParens scrut, ptext SLIT("of"), ppr bndr,
219 braces (hsep (map pp_alt alts))])
221 pp_alt (UfTupleAlt tup_con, bs, rhs) = hsTupParens tup_con (interpp'SP bs) <+> ppr_rhs rhs
222 pp_alt (c, bs, rhs) = ppr c <+> hsep (map pp_bndr bs) <+> ppr_rhs rhs
224 ppr_rhs rhs = ptext SLIT("->") <+> pprUfExpr noParens rhs <> semi
226 -- This use of getOccName is the sole reason for the NamedThing in pprUfExpr's type
227 pp_bndr v | isTvOcc (getOccName v) = char '@' <+> ppr v
230 pprUfExpr add_par (UfLet (UfNonRec b rhs) body)
231 = add_par (hsep [ptext SLIT("let"),
232 braces (ppr b <+> equals <+> pprUfExpr noParens rhs),
233 ptext SLIT("in"), pprUfExpr noParens body])
235 pprUfExpr add_par (UfLet (UfRec pairs) body)
236 = add_par (hsep [ptext SLIT("__letrec"), braces (hsep (map pp_pair pairs)),
237 ptext SLIT("in"), pprUfExpr noParens body])
239 pp_pair (b,rhs) = ppr b <+> equals <+> pprUfExpr noParens rhs <> semi
241 pprUfExpr add_par (UfNote note body) = add_par (ppr note <+> pprUfExpr parens body)
243 pprUfApp (UfApp fun arg) = pprUfApp fun <+> pprUfExpr parens arg
244 pprUfApp fun = pprUfExpr parens fun
246 collectUfBndrs :: UfExpr name -> ([UfBinder name], UfExpr name)
250 go bs (UfLam b e) = go (b:bs) e
251 go bs e = (reverse bs, e)
253 instance Outputable name => Outputable (UfNote name) where
254 ppr (UfSCC cc) = pprCostCentreCore cc
255 ppr (UfCoerce ty) = ptext SLIT("__coerce") <+> pprParendHsType ty
256 ppr UfInlineCall = ptext SLIT("__inline_call")
257 ppr UfInlineMe = ptext SLIT("__inline_me")
259 instance Outputable name => Outputable (UfConAlt name) where
260 ppr UfDefault = text "__DEFAULT"
261 ppr (UfLitAlt l) = ppr l
262 ppr (UfLitLitAlt l ty) = parens (hsep [ptext SLIT("__litlit"), pprHsString l, pprParendHsType ty])
263 ppr (UfDataAlt d) = ppr d
265 instance Outputable name => Outputable (UfBinder name) where
266 ppr (UfValBinder name ty) = hsep [ppr name, dcolon, pprParendHsType ty]
267 ppr (UfTyBinder name kind) = char '@' <+> pprHsTyVarBndr name kind
271 %************************************************************************
273 \subsection[HsCore-print]{Equality, for interface file checking
275 %************************************************************************
277 ----------------------------------------
279 ----------------------------------------
281 Whe comparing UfExprs, we compare names by converting to RdrNames and comparing
282 those. Reason: this is used when comparing ufoldings in interface files, and the
283 uniques can differ. Converting to RdrNames makes it more like comparing the file
284 contents directly. But this is bad: version numbers can change when only alpha-conversion
287 The hack shows up in eq_ufVar
288 There are corresponding getOccName calls in MkIface.diffDecls
290 ----------------------------------------
292 ----------------------------------------
296 instance (NamedThing name, Ord name) => Eq (UfExpr name) where
297 (==) a b = eq_ufExpr emptyEqHsEnv a b
300 eq_ufBinder env (UfValBinder n1 t1) (UfValBinder n2 t2) k
301 = eq_hsType env t1 t2 && k (extendEqHsEnv env n1 n2)
302 eq_ufBinder env (UfTyBinder n1 k1) (UfTyBinder n2 k2) k
303 = k1 `eqKind` k2 && k (extendEqHsEnv env n1 n2)
304 eq_ufBinder _ _ _ _ = False
307 eq_ufBinders env [] [] k = k env
308 eq_ufBinders env (b1:bs1) (b2:bs2) k = eq_ufBinder env b1 b2 (\env -> eq_ufBinders env bs1 bs2 k)
309 eq_ufBinders env _ _ _ = False
312 eq_ufVar :: (NamedThing name, Ord name) => EqHsEnv name -> name -> name -> Bool
313 -- Compare *Rdr* names. A real hack to avoid gratuitous
314 -- differences when comparing interface files
315 eq_ufVar env n1 n2 = case lookupFM env n1 of
316 Just n1 -> toRdrName n1 == toRdrName n2
317 Nothing -> toRdrName n1 == toRdrName n2
321 eq_ufExpr :: (NamedThing name, Ord name) => EqHsEnv name -> UfExpr name -> UfExpr name -> Bool
322 eq_ufExpr env (UfVar v1) (UfVar v2) = eq_ufVar env v1 v2
323 eq_ufExpr env (UfLit l1) (UfLit l2) = l1 == l2
324 eq_ufExpr env (UfLitLit l1 ty1) (UfLitLit l2 ty2) = l1==l2 && eq_hsType env ty1 ty2
325 eq_ufExpr env (UfFCall c1 ty1) (UfFCall c2 ty2) = c1==c2 && eq_hsType env ty1 ty2
326 eq_ufExpr env (UfType ty1) (UfType ty2) = eq_hsType env ty1 ty2
327 eq_ufExpr env (UfTuple n1 as1) (UfTuple n2 as2) = n1==n2 && eqListBy (eq_ufExpr env) as1 as2
328 eq_ufExpr env (UfLam b1 body1) (UfLam b2 body2) = eq_ufBinder env b1 b2 (\env -> eq_ufExpr env body1 body2)
329 eq_ufExpr env (UfApp f1 a1) (UfApp f2 a2) = eq_ufExpr env f1 f2 && eq_ufExpr env a1 a2
331 eq_ufExpr env (UfCase s1 b1 as1) (UfCase s2 b2 as2)
332 = eq_ufExpr env s1 s2 &&
333 eqListBy (eq_ufAlt (extendEqHsEnv env b1 b2)) as1 as2
335 eq_ufAlt env (c1,bs1,r1) (c2,bs2,r2)
336 = eq_ufConAlt env c1 c2 && eq_hsVars env bs1 bs2 (\env -> eq_ufExpr env r1 r2)
338 eq_ufExpr env (UfLet (UfNonRec b1 r1) x1) (UfLet (UfNonRec b2 r2) x2)
339 = eq_ufExpr env r1 r2 && eq_ufBinder env b1 b2 (\env -> eq_ufExpr env x1 x2)
341 eq_ufExpr env (UfLet (UfRec as1) x1) (UfLet (UfRec as2) x2)
342 = eq_ufBinders env bs1 bs2 (\env -> eqListBy (eq_ufExpr env) rs1 rs2 && eq_ufExpr env x1 x2)
344 (bs1,rs1) = unzip as1
345 (bs2,rs2) = unzip as2
347 eq_ufExpr env (UfNote n1 r1) (UfNote n2 r2)
348 = eq_ufNote n1 n2 && eq_ufExpr env r1 r2
350 eq_ufNote (UfSCC c1) (UfSCC c2) = c1==c2
351 eq_ufNote (UfCoerce t1) (UfCoerce t2) = eq_hsType env t1 t2
352 eq_ufNote UfInlineCall UfInlineCall = True
353 eq_ufNote UfInlineMe UfInlineMe = True
354 eq_ufNote _ _ = False
356 eq_ufExpr env _ _ = False
359 eq_ufConAlt env UfDefault UfDefault = True
360 eq_ufConAlt env (UfDataAlt n1) (UfDataAlt n2) = n1==n2
361 eq_ufConAlt env (UfTupleAlt c1) (UfTupleAlt c2) = c1==c2
362 eq_ufConAlt env (UfLitAlt l1) (UfLitAlt l2) = l1==l2
363 eq_ufConAlt env (UfLitLitAlt s1 t1) (UfLitLitAlt s2 t2) = s1==s2 && eq_hsType env t1 t2
364 eq_ufConAlt env _ _ = False
368 %************************************************************************
370 \subsection{Rules in interface files}
372 %************************************************************************
375 pprHsIdInfo :: (NamedThing n, Outputable n) => [HsIdInfo n] -> SDoc
376 pprHsIdInfo [] = empty
377 pprHsIdInfo info = ptext SLIT("{-##") <+> hsep (map ppr_hs_info info) <+> ptext SLIT("##-}")
381 | HsStrictness StrictnessInfo
382 | HsUnfold InlinePragInfo (UfExpr name)
385 | HsWorker name Arity -- Worker, if any see IdInfo.WorkerInfo
386 -- for why we want arity here.
388 -- NB: Specialisations and rules come in separately and are
389 -- only later attached to the Id. Partial reason: some are orphans.
391 ppr_hs_info (HsUnfold prag unf) = ptext SLIT("__U") <> pprInlinePragInfo prag <+> parens (pprUfExpr noParens unf)
392 ppr_hs_info (HsArity arity) = ptext SLIT("__A") <+> int arity
393 ppr_hs_info (HsStrictness str) = ptext SLIT("__S") <+> ppStrictnessInfo str
394 ppr_hs_info HsNoCafRefs = ptext SLIT("__C")
395 ppr_hs_info HsCprInfo = ptext SLIT("__M")
396 ppr_hs_info (HsWorker w a) = ptext SLIT("__P") <+> ppr w <+> int a