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, isPrimOpId_maybe )
35 import Var ( varType, isId )
36 import IdInfo ( ArityInfo, InlinePragInfo,
37 pprInlinePragInfo, ppArityInfo, ppStrictnessInfo
39 import Name ( Name, NamedThing(..), getName, toRdrName )
40 import RdrName ( RdrName, rdrNameOcc )
41 import OccName ( isTvOcc )
43 import CostCentre ( pprCostCentreCore )
44 import PrimOp ( PrimOp(CCallOp) )
45 import Demand ( StrictnessInfo )
46 import Literal ( Literal, maybeLitLit )
47 import PrimOp ( CCall, pprCCallOp )
48 import DataCon ( dataConTyCon, dataConSourceArity )
49 import TyCon ( isTupleTyCon, tupleTyConBoxity )
51 import BasicTypes ( Arity )
52 import FiniteMap ( lookupFM )
57 %************************************************************************
59 \subsection[HsCore-types]{Types for read/written Core unfoldings}
61 %************************************************************************
66 | UfType (HsType name)
67 | UfTuple (HsTupCon name) [UfExpr name] -- Type arguments omitted
68 | UfLam (UfBinder name) (UfExpr name)
69 | UfApp (UfExpr name) (UfExpr name)
70 | UfCase (UfExpr name) name [UfAlt name]
71 | UfLet (UfBinding name) (UfExpr name)
72 | UfNote (UfNote name) (UfExpr name)
74 | UfLitLit FAST_STRING (HsType name)
75 | UfCCall CCall (HsType name)
77 data UfNote name = UfSCC CostCentre
78 | UfCoerce (HsType name)
82 type UfAlt name = (UfConAlt name, [name], UfExpr name)
84 data UfConAlt name = UfDefault
86 | UfTupleAlt (HsTupCon name)
88 | UfLitLitAlt FAST_STRING (HsType name)
91 = UfNonRec (UfBinder name)
93 | UfRec [(UfBinder name, UfExpr name)]
96 = UfValBinder name (HsType name)
97 | UfTyBinder name Kind
99 ufBinderName :: UfBinder name -> name
100 ufBinderName (UfValBinder n _) = n
101 ufBinderName (UfTyBinder n _) = n
105 %************************************************************************
107 \subsection{Converting from Core to UfCore}
109 %************************************************************************
112 toUfExpr :: CoreExpr -> UfExpr Name
113 toUfExpr (Var v) = toUfVar v
114 toUfExpr (Lit l) = case maybeLitLit l of
115 Just (s,ty) -> UfLitLit s (toHsType ty)
117 toUfExpr (Type ty) = UfType (toHsType ty)
118 toUfExpr (Lam x b) = UfLam (toUfBndr x) (toUfExpr b)
119 toUfExpr (App f a) = toUfApp f [a]
120 toUfExpr (Case s x as) = UfCase (toUfExpr s) (getName x) (map toUfAlt as)
121 toUfExpr (Let b e) = UfLet (toUfBind b) (toUfExpr e)
122 toUfExpr (Note n e) = UfNote (toUfNote n) (toUfExpr e)
124 ---------------------
125 toUfNote (SCC cc) = UfSCC cc
126 toUfNote (Coerce t1 _) = UfCoerce (toHsType t1)
127 toUfNote InlineCall = UfInlineCall
128 toUfNote InlineMe = UfInlineMe
130 ---------------------
131 toUfBind (NonRec b r) = UfNonRec (toUfBndr b) (toUfExpr r)
132 toUfBind (Rec prs) = UfRec [(toUfBndr b, toUfExpr r) | (b,r) <- prs]
134 ---------------------
135 toUfAlt (c,bs,r) = (toUfCon c, map getName bs, toUfExpr r)
137 ---------------------
138 toUfCon (DataAlt dc) | isTupleTyCon tc = UfTupleAlt (mk_hs_tup_con tc dc)
139 | otherwise = UfDataAlt (getName dc)
143 toUfCon (LitAlt l) = case maybeLitLit l of
144 Just (s,ty) -> UfLitLitAlt s (toHsType ty)
145 Nothing -> UfLitAlt l
146 toUfCon DEFAULT = UfDefault
148 ---------------------
149 mk_hs_tup_con tc dc = HsTupCon (getName dc) (tupleTyConBoxity tc) (dataConSourceArity dc)
151 ---------------------
152 toUfBndr x | isId x = UfValBinder (getName x) (toHsType (varType x))
153 | otherwise = UfTyBinder (getName x) (varType x)
155 ---------------------
156 toUfApp (App f a) as = toUfApp f (a:as)
158 = case isDataConId_maybe v of
159 -- We convert the *worker* for tuples into UfTuples
160 Just dc | isTupleTyCon tc && saturated
161 -> UfTuple (mk_hs_tup_con tc dc) tup_args
163 val_args = dropWhile isTypeArg as
164 saturated = length val_args == idArity v
165 tup_args = map toUfExpr val_args
169 other -> mkUfApps (toUfVar v) as
171 toUfApp e as = mkUfApps (toUfExpr e) as
173 mkUfApps = foldl (\f a -> UfApp f (toUfExpr a))
175 ---------------------
176 toUfVar v = case isPrimOpId_maybe v of
177 -- Ccalls has special syntax
178 Just (CCallOp cc) -> UfCCall cc (toHsType (idType v))
179 other -> UfVar (getName v)
183 %************************************************************************
185 \subsection[HsCore-print]{Printing Core unfoldings}
187 %************************************************************************
190 instance (NamedThing name, Outputable name) => Outputable (UfExpr name) where
191 ppr e = pprUfExpr noParens e
194 -- Small-hack alert: this instance allows us to do a getOccName on RdrNames.
195 -- Important because we want to pretty-print UfExprs, and we have to
196 -- print an '@' before tyvar-binders in a case alternative.
197 instance NamedThing RdrName where
198 getOccName n = rdrNameOcc n
199 getName n = pprPanic "instance NamedThing RdrName" (ppr n)
201 noParens :: SDoc -> SDoc
204 pprUfExpr :: (NamedThing name, Outputable name) => (SDoc -> SDoc) -> UfExpr name -> SDoc
205 -- The function adds parens in context that need
206 -- an atomic value (e.g. function args)
208 pprUfExpr add_par (UfVar v) = ppr v
209 pprUfExpr add_par (UfLit l) = ppr l
210 pprUfExpr add_par (UfLitLit l ty) = add_par (hsep [ptext SLIT("__litlit"), pprHsString l, pprParendHsType ty])
211 pprUfExpr add_par (UfCCall cc ty) = braces (pprCCallOp cc <+> ppr ty)
212 pprUfExpr add_par (UfType ty) = char '@' <+> pprParendHsType ty
214 pprUfExpr add_par e@(UfLam _ _) = add_par (char '\\' <+> hsep (map ppr bndrs)
215 <+> ptext SLIT("->") <+> pprUfExpr noParens body)
216 where (bndrs,body) = collectUfBndrs e
217 pprUfExpr add_par app@(UfApp _ _) = add_par (pprUfApp app)
218 pprUfExpr add_par (UfTuple c as) = hsTupParens c (interpp'SP as)
220 pprUfExpr add_par (UfCase scrut bndr alts)
221 = add_par (hsep [ptext SLIT("case"), pprUfExpr noParens scrut, ptext SLIT("of"), ppr bndr,
222 braces (hsep (map pp_alt alts))])
224 pp_alt (UfTupleAlt tup_con, bs, rhs) = hsTupParens tup_con (interpp'SP bs) <+> ppr_rhs rhs
225 pp_alt (c, bs, rhs) = ppr c <+> hsep (map pp_bndr bs) <+> ppr_rhs rhs
227 ppr_rhs rhs = ptext SLIT("->") <+> pprUfExpr noParens rhs <> semi
229 -- This use of getOccName is the sole reason for the NamedThing in pprUfExpr's type
230 pp_bndr v | isTvOcc (getOccName v) = char '@' <+> ppr v
233 pprUfExpr add_par (UfLet (UfNonRec b rhs) body)
234 = add_par (hsep [ptext SLIT("let"),
235 braces (ppr b <+> equals <+> pprUfExpr noParens rhs),
236 ptext SLIT("in"), pprUfExpr noParens body])
238 pprUfExpr add_par (UfLet (UfRec pairs) body)
239 = add_par (hsep [ptext SLIT("__letrec"), braces (hsep (map pp_pair pairs)),
240 ptext SLIT("in"), pprUfExpr noParens body])
242 pp_pair (b,rhs) = ppr b <+> equals <+> pprUfExpr noParens rhs <> semi
244 pprUfExpr add_par (UfNote note body) = add_par (ppr note <+> pprUfExpr parens body)
246 pprUfApp (UfApp fun arg) = pprUfApp fun <+> pprUfExpr parens arg
247 pprUfApp fun = pprUfExpr parens fun
249 collectUfBndrs :: UfExpr name -> ([UfBinder name], UfExpr name)
253 go bs (UfLam b e) = go (b:bs) e
254 go bs e = (reverse bs, e)
256 instance Outputable name => Outputable (UfNote name) where
257 ppr (UfSCC cc) = pprCostCentreCore cc
258 ppr (UfCoerce ty) = ptext SLIT("__coerce") <+> pprParendHsType ty
259 ppr UfInlineCall = ptext SLIT("__inline_call")
260 ppr UfInlineMe = ptext SLIT("__inline_me")
262 instance Outputable name => Outputable (UfConAlt name) where
263 ppr UfDefault = text "__DEFAULT"
264 ppr (UfLitAlt l) = ppr l
265 ppr (UfLitLitAlt l ty) = parens (hsep [ptext SLIT("__litlit"), pprHsString l, pprParendHsType ty])
266 ppr (UfDataAlt d) = ppr d
268 instance Outputable name => Outputable (UfBinder name) where
269 ppr (UfValBinder name ty) = hsep [ppr name, dcolon, pprParendHsType ty]
270 ppr (UfTyBinder name kind) = char '@' <+> pprHsTyVarBndr name kind
274 %************************************************************************
276 \subsection[HsCore-print]{Equality, for interface file checking
278 %************************************************************************
280 ----------------------------------------
282 ----------------------------------------
284 Whe comparing UfExprs, we compare names by converting to RdrNames and comparing
285 those. Reason: this is used when comparing ufoldings in interface files, and the
286 uniques can differ. Converting to RdrNames makes it more like comparing the file
287 contents directly. But this is bad: version numbers can change when only alpha-conversion
290 The hack shows up in eq_ufVar
291 There are corresponding getOccName calls in MkIface.diffDecls
293 ----------------------------------------
295 ----------------------------------------
299 instance (NamedThing name, Ord name) => Eq (UfExpr name) where
300 (==) a b = eq_ufExpr emptyEqHsEnv a b
303 eq_ufBinder env (UfValBinder n1 t1) (UfValBinder n2 t2) k
304 = eq_hsType env t1 t2 && k (extendEqHsEnv env n1 n2)
305 eq_ufBinder env (UfTyBinder n1 k1) (UfTyBinder n2 k2) k
306 = k1==k2 && k (extendEqHsEnv env n1 n2)
307 eq_ufBinder _ _ _ _ = False
310 eq_ufBinders env [] [] k = k env
311 eq_ufBinders env (b1:bs1) (b2:bs2) k = eq_ufBinder env b1 b2 (\env -> eq_ufBinders env bs1 bs2 k)
312 eq_ufBinders env _ _ _ = False
315 eq_ufVar :: (NamedThing name, Ord name) => EqHsEnv name -> name -> name -> Bool
316 -- Compare *Rdr* names. A real hack to avoid gratuitous
317 -- differences when comparing interface files
318 eq_ufVar env n1 n2 = case lookupFM env n1 of
319 Just n1 -> toRdrName n1 == toRdrName n2
320 Nothing -> toRdrName n1 == toRdrName n2
324 eq_ufExpr :: (NamedThing name, Ord name) => EqHsEnv name -> UfExpr name -> UfExpr name -> Bool
325 eq_ufExpr env (UfVar v1) (UfVar v2) = eq_ufVar env v1 v2
326 eq_ufExpr env (UfLit l1) (UfLit l2) = l1 == l2
327 eq_ufExpr env (UfLitLit l1 ty1) (UfLitLit l2 ty2) = l1==l2 && eq_hsType env ty1 ty2
328 eq_ufExpr env (UfCCall c1 ty1) (UfCCall c2 ty2) = c1==c2 && eq_hsType env ty1 ty2
329 eq_ufExpr env (UfType ty1) (UfType ty2) = eq_hsType env ty1 ty2
330 eq_ufExpr env (UfTuple n1 as1) (UfTuple n2 as2) = n1==n2 && eqListBy (eq_ufExpr env) as1 as2
331 eq_ufExpr env (UfLam b1 body1) (UfLam b2 body2) = eq_ufBinder env b1 b2 (\env -> eq_ufExpr env body1 body2)
332 eq_ufExpr env (UfApp f1 a1) (UfApp f2 a2) = eq_ufExpr env f1 f2 && eq_ufExpr env a1 a2
334 eq_ufExpr env (UfCase s1 b1 as1) (UfCase s2 b2 as2)
335 = eq_ufExpr env s1 s2 &&
336 eqListBy (eq_ufAlt (extendEqHsEnv env b1 b2)) as1 as2
338 eq_ufAlt env (c1,bs1,r1) (c2,bs2,r2)
339 = eq_ufConAlt env c1 c2 && eq_hsVars env bs1 bs2 (\env -> eq_ufExpr env r1 r2)
341 eq_ufExpr env (UfLet (UfNonRec b1 r1) x1) (UfLet (UfNonRec b2 r2) x2)
342 = eq_ufExpr env r1 r2 && eq_ufBinder env b1 b2 (\env -> eq_ufExpr env x1 x2)
344 eq_ufExpr env (UfLet (UfRec as1) x1) (UfLet (UfRec as2) x2)
345 = eq_ufBinders env bs1 bs2 (\env -> eqListBy (eq_ufExpr env) rs1 rs2 && eq_ufExpr env x1 x2)
347 (bs1,rs1) = unzip as1
348 (bs2,rs2) = unzip as2
350 eq_ufExpr env (UfNote n1 r1) (UfNote n2 r2)
351 = eq_ufNote n1 n2 && eq_ufExpr env r1 r2
353 eq_ufNote (UfSCC c1) (UfSCC c2) = c1==c2
354 eq_ufNote (UfCoerce t1) (UfCoerce t2) = eq_hsType env t1 t2
355 eq_ufNote UfInlineCall UfInlineCall = True
356 eq_ufNote UfInlineMe UfInlineMe = True
357 eq_ufNote _ _ = False
359 eq_ufExpr env _ _ = False
362 eq_ufConAlt env UfDefault UfDefault = True
363 eq_ufConAlt env (UfDataAlt n1) (UfDataAlt n2) = n1==n2
364 eq_ufConAlt env (UfTupleAlt c1) (UfTupleAlt c2) = c1==c2
365 eq_ufConAlt env (UfLitAlt l1) (UfLitAlt l2) = l1==l2
366 eq_ufConAlt env (UfLitLitAlt s1 t1) (UfLitLitAlt s2 t2) = s1==s2 && eq_hsType env t1 t2
367 eq_ufConAlt env _ _ = False
371 %************************************************************************
373 \subsection{Rules in interface files}
375 %************************************************************************
378 pprHsIdInfo :: (NamedThing n, Outputable n) => [HsIdInfo n] -> SDoc
379 pprHsIdInfo [] = empty
380 pprHsIdInfo info = ptext SLIT("{-##") <+> hsep (map ppr_hs_info info) <+> ptext SLIT("##-}")
384 | HsStrictness StrictnessInfo
385 | HsUnfold InlinePragInfo (UfExpr name)
388 | HsWorker name Arity -- Worker, if any see IdInfo.WorkerInfo
389 -- for why we want arity here.
391 -- NB: Specialisations and rules come in separately and are
392 -- only later attached to the Id. Partial reason: some are orphans.
394 ppr_hs_info (HsUnfold prag unf) = ptext SLIT("__U") <> pprInlinePragInfo prag <+> parens (pprUfExpr noParens unf)
395 ppr_hs_info (HsArity arity) = ptext SLIT("__A") <+> int arity
396 ppr_hs_info (HsStrictness str) = ptext SLIT("__S") <+> ppStrictnessInfo str
397 ppr_hs_info HsNoCafRefs = ptext SLIT("__C")
398 ppr_hs_info HsCprInfo = ptext SLIT("__M")
399 ppr_hs_info (HsWorker w a) = ptext SLIT("__P") <+> ppr w <+> int a