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(..),
18 IfaceSig(..), ifaceSigName,
20 eq_ufExpr, eq_ufBinders, pprUfExpr,
25 #include "HsVersions.h"
28 import HsTypes ( HsType, pprParendHsType, pprHsTyVarBndr, toHsType,
29 HsTupCon(..), hsTupParens,
30 emptyEqHsEnv, extendEqHsEnv, eqListBy,
31 eq_hsType, eq_hsVar, eq_hsVars
35 import Id ( idArity, idType, isDataConId_maybe, isPrimOpId_maybe )
36 import Var ( varType, isId )
37 import IdInfo ( ArityInfo, InlinePragInfo,
38 pprInlinePragInfo, ppArityInfo, ppStrictnessInfo
40 import Name ( Name, getName )
42 import CostCentre ( pprCostCentreCore )
43 import PrimOp ( PrimOp(CCallOp) )
44 import Demand ( StrictnessInfo )
45 import Literal ( Literal, maybeLitLit )
46 import PrimOp ( CCall, pprCCallOp )
47 import DataCon ( dataConTyCon )
48 import TyCon ( isTupleTyCon, tupleTyConBoxity )
51 import SrcLoc ( SrcLoc )
55 %************************************************************************
57 \subsection[HsCore-types]{Types for read/written Core unfoldings}
59 %************************************************************************
64 | UfType (HsType name)
65 | UfTuple (HsTupCon name) [UfExpr name] -- Type arguments omitted
66 | UfLam (UfBinder name) (UfExpr name)
67 | UfApp (UfExpr name) (UfExpr name)
68 | UfCase (UfExpr name) name [UfAlt name]
69 | UfLet (UfBinding name) (UfExpr name)
70 | UfNote (UfNote name) (UfExpr name)
72 | UfLitLit FAST_STRING (HsType name)
73 | UfCCall CCall (HsType name)
75 data UfNote name = UfSCC CostCentre
76 | UfCoerce (HsType name)
80 type UfAlt name = (UfConAlt name, [name], UfExpr name)
82 data UfConAlt name = UfDefault
84 | UfTupleAlt (HsTupCon name)
86 | UfLitLitAlt FAST_STRING (HsType name)
89 = UfNonRec (UfBinder name)
91 | UfRec [(UfBinder name, UfExpr name)]
94 = UfValBinder name (HsType name)
95 | UfTyBinder name Kind
99 %************************************************************************
101 \subsection{Converting from Core to UfCore}
103 %************************************************************************
106 toUfExpr :: CoreExpr -> UfExpr Name
107 toUfExpr (Var v) = toUfVar v
108 toUfExpr (Lit l) = case maybeLitLit l of
109 Just (s,ty) -> UfLitLit s (toHsType ty)
111 toUfExpr (Type ty) = UfType (toHsType ty)
112 toUfExpr (Lam x b) = UfLam (toUfBndr x) (toUfExpr b)
113 toUfExpr (App f a) = toUfApp f [a]
114 toUfExpr (Case s x as) = UfCase (toUfExpr s) (getName x) (map toUfAlt as)
115 toUfExpr (Let b e) = UfLet (toUfBind b) (toUfExpr e)
116 toUfExpr (Note n e) = UfNote (toUfNote n) (toUfExpr e)
118 ---------------------
119 toUfNote (SCC cc) = UfSCC cc
120 toUfNote (Coerce t1 _) = UfCoerce (toHsType t1)
121 toUfNote InlineCall = UfInlineCall
122 toUfNote InlineMe = UfInlineMe
124 ---------------------
125 toUfBind (NonRec b r) = UfNonRec (toUfBndr b) (toUfExpr r)
126 toUfBind (Rec prs) = UfRec [(toUfBndr b, toUfExpr r) | (b,r) <- prs]
128 ---------------------
129 toUfAlt (c,bs,r) = (toUfCon c, map getName bs, toUfExpr r)
131 ---------------------
132 toUfCon (DataAlt dc) | isTupleTyCon tc = UfTupleAlt (HsTupCon (getName dc) (tupleTyConBoxity tc))
133 | otherwise = UfDataAlt (getName dc)
137 toUfCon (LitAlt l) = case maybeLitLit l of
138 Just (s,ty) -> UfLitLitAlt s (toHsType ty)
139 Nothing -> UfLitAlt l
140 toUfCon DEFAULT = UfDefault
142 ---------------------
143 toUfBndr x | isId x = UfValBinder (getName x) (toHsType (varType x))
144 | otherwise = UfTyBinder (getName x) (varType x)
146 ---------------------
147 toUfApp (App f a) as = toUfApp f (a:as)
149 = case isDataConId_maybe v of
150 -- We convert the *worker* for tuples into UfTuples
151 Just dc | isTupleTyCon tc && saturated -> UfTuple (HsTupCon (getName dc) (tupleTyConBoxity tc)) tup_args
153 val_args = dropWhile isTypeArg as
154 saturated = length val_args == idArity v
155 tup_args = map toUfExpr val_args
159 other -> mkUfApps (toUfVar v) as
161 toUfApp e as = mkUfApps (toUfExpr e) as
163 mkUfApps = foldl (\f a -> UfApp f (toUfExpr a))
165 ---------------------
166 toUfVar v = case isPrimOpId_maybe v of
167 -- Ccalls has special syntax
168 Just (CCallOp cc) -> UfCCall cc (toHsType (idType v))
169 other -> UfVar (getName v)
173 %************************************************************************
175 \subsection[HsCore-print]{Printing Core unfoldings}
177 %************************************************************************
180 instance Outputable name => Outputable (UfExpr name) where
181 ppr e = pprUfExpr noParens e
183 noParens :: SDoc -> SDoc
186 pprUfExpr :: Outputable name => (SDoc -> SDoc) -> UfExpr name -> SDoc
187 -- The function adds parens in context that need
188 -- an atomic value (e.g. function args)
190 pprUfExpr add_par (UfVar v) = ppr v
191 pprUfExpr add_par (UfLit l) = ppr l
192 pprUfExpr add_par (UfLitLit l ty) = add_par (hsep [ptext SLIT("__litlit"), pprHsString l, pprParendHsType ty])
193 pprUfExpr add_par (UfCCall cc ty) = braces (pprCCallOp cc <+> ppr ty)
194 pprUfExpr add_par (UfType ty) = char '@' <+> pprParendHsType ty
196 pprUfExpr add_par e@(UfLam _ _) = add_par (char '\\' <+> hsep (map ppr bndrs)
197 <+> ptext SLIT("->") <+> pprUfExpr noParens body)
198 where (bndrs,body) = collectUfBndrs e
199 pprUfExpr add_par (UfApp fun arg) = add_par (pprUfExpr noParens fun <+> pprUfExpr parens arg)
200 pprUfExpr add_par (UfTuple c as) = hsTupParens c (interpp'SP as)
202 pprUfExpr add_par (UfCase scrut bndr alts)
203 = add_par (hsep [ptext SLIT("case"), pprUfExpr noParens scrut, ptext SLIT("of"), ppr bndr,
204 braces (hsep (map pp_alt alts))])
206 pp_alt (UfTupleAlt tup_con, bs, rhs) = hsTupParens tup_con (interpp'SP bs) <+> ppr_rhs rhs
207 pp_alt (c, bs, rhs) = ppr c <+> interppSP bs <+> ppr_rhs rhs
209 ppr_rhs rhs = ptext SLIT("->") <+> pprUfExpr noParens rhs <> semi
211 pprUfExpr add_par (UfLet (UfNonRec b rhs) body)
212 = add_par (hsep [ptext SLIT("let"),
213 braces (ppr b <+> equals <+> pprUfExpr noParens rhs),
214 ptext SLIT("in"), pprUfExpr noParens body])
216 pprUfExpr add_par (UfLet (UfRec pairs) body)
217 = add_par (hsep [ptext SLIT("__letrec"), braces (hsep (map pp_pair pairs)),
218 ptext SLIT("in"), pprUfExpr noParens body])
220 pp_pair (b,rhs) = ppr b <+> equals <+> pprUfExpr noParens rhs <> semi
222 pprUfExpr add_par (UfNote note body) = add_par (ppr note <+> pprUfExpr parens body)
224 collectUfBndrs :: UfExpr name -> ([UfBinder name], UfExpr name)
228 go bs (UfLam b e) = go (b:bs) e
229 go bs e = (reverse bs, e)
231 instance Outputable name => Outputable (UfNote name) where
232 ppr (UfSCC cc) = pprCostCentreCore cc
233 ppr (UfCoerce ty) = ptext SLIT("__coerce") <+> pprParendHsType ty
234 ppr UfInlineCall = ptext SLIT("__inline_call")
235 ppr UfInlineMe = ptext SLIT("__inline_me")
237 instance Outputable name => Outputable (UfConAlt name) where
238 ppr UfDefault = text "__DEFAULT"
239 ppr (UfLitAlt l) = ppr l
240 ppr (UfLitLitAlt l ty) = parens (hsep [ptext SLIT("__litlit"), pprHsString l, pprParendHsType ty])
241 ppr (UfDataAlt d) = ppr d
243 instance Outputable name => Outputable (UfBinder name) where
244 ppr (UfValBinder name ty) = hsep [ppr name, dcolon, pprParendHsType ty]
245 ppr (UfTyBinder name kind) = char '@' <+> pprHsTyVarBndr name kind
249 %************************************************************************
251 \subsection[HsCore-print]{Equality, for interface file checking
253 %************************************************************************
256 instance Ord name => Eq (UfExpr name) where
257 (==) a b = eq_ufExpr emptyEqHsEnv a b
260 eq_ufBinder env (UfValBinder n1 t1) (UfValBinder n2 t2) k
261 = eq_hsType env t1 t2 && k (extendEqHsEnv env n1 n2)
262 eq_ufBinder env (UfTyBinder n1 k1) (UfTyBinder n2 k2) k
263 = k1==k2 && k (extendEqHsEnv env n1 n2)
264 eq_ufBinder _ _ _ _ = False
267 eq_ufBinders env [] [] k = k env
268 eq_ufBinders env (b1:bs1) (b2:bs2) k = eq_ufBinder env b1 b2 (\env -> eq_ufBinders env bs1 bs2 k)
269 eq_ufBinders env _ _ _ = False
272 eq_ufExpr env (UfVar v1) (UfVar v2) = eq_hsVar env v1 v2
273 eq_ufExpr env (UfLit l1) (UfLit l2) = l1 == l2
274 eq_ufExpr env (UfLitLit l1 ty1) (UfLitLit l2 ty2) = l1==l2 && eq_hsType env ty1 ty2
275 eq_ufExpr env (UfCCall c1 ty1) (UfCCall c2 ty2) = c1==c2 && eq_hsType env ty1 ty2
276 eq_ufExpr env (UfType ty1) (UfType ty2) = eq_hsType env ty1 ty2
277 eq_ufExpr env (UfTuple n1 as1) (UfTuple n2 as2) = n1==n2 && eqListBy (eq_ufExpr env) as1 as2
278 eq_ufExpr env (UfLam b1 body1) (UfLam b2 body2) = eq_ufBinder env b1 b2 (\env -> eq_ufExpr env body1 body2)
279 eq_ufExpr env (UfApp f1 a1) (UfApp f2 a2) = eq_ufExpr env f1 f2 && eq_ufExpr env a1 a2
281 eq_ufExpr env (UfCase s1 b1 as1) (UfCase s2 b2 as2)
282 = eq_ufExpr env s1 s2 &&
283 eqListBy (eq_ufAlt (extendEqHsEnv env b1 b2)) as1 as2
285 eq_ufAlt env (c1,bs1,r1) (c2,bs2,r2)
286 = eq_ufConAlt env c1 c2 && eq_hsVars env bs1 bs2 (\env -> eq_ufExpr env r1 r2)
288 eq_ufExpr env (UfLet (UfNonRec b1 r1) x1) (UfLet (UfNonRec b2 r2) x2)
289 = eq_ufExpr env r1 r2 && eq_ufBinder env b1 b2 (\env -> eq_ufExpr env x1 x2)
291 eq_ufExpr env (UfLet (UfRec as1) x1) (UfLet (UfRec as2) x2)
292 = eq_ufBinders env bs1 bs2 (\env -> eqListBy (eq_ufExpr env) rs1 rs2 && eq_ufExpr env x1 x2)
294 (bs1,rs1) = unzip as1
295 (bs2,rs2) = unzip as2
297 eq_ufExpr env (UfNote n1 r1) (UfNote n2 r2)
298 = eq_ufNote n1 n2 && eq_ufExpr env r1 r2
300 eq_ufNote (UfSCC c1) (UfSCC c2) = c1==c2
301 eq_ufNote (UfCoerce t1) (UfCoerce t2) = eq_hsType env t1 t2
302 eq_ufNote UfInlineCall UfInlineCall = True
303 eq_ufNote UfInlineMe UfInlineMe = True
304 eq_ufNote _ _ = False
306 eq_ufExpr env _ _ = False
309 eq_ufConAlt env UfDefault UfDefault = True
310 eq_ufConAlt env (UfDataAlt n1) (UfDataAlt n2) = n1==n2
311 eq_ufConAlt env (UfTupleAlt c1) (UfTupleAlt c2) = c1==c2
312 eq_ufConAlt env (UfLitAlt l1) (UfLitAlt l2) = l1==l2
313 eq_ufConAlt env (UfLitLitAlt s1 t1) (UfLitLitAlt s2 t2) = s1==s2 && eq_hsType env t1 t2
314 eq_ufConAlt env _ _ = False
318 %************************************************************************
320 \subsection{Signatures in interface files}
322 %************************************************************************
325 data IfaceSig name = IfaceSig name (HsType name) [HsIdInfo name] SrcLoc
327 instance Ord name => Eq (IfaceSig name) where
328 (==) (IfaceSig n1 t1 i1 _) (IfaceSig n2 t2 i2 _) = n1==n2 && t1==t2 && i1==i2
330 instance (Outputable name) => Outputable (IfaceSig name) where
331 ppr (IfaceSig var ty info _) = hsep [ppr var, dcolon, ppr ty, pprHsIdInfo info]
333 ifaceSigName :: IfaceSig name -> name
334 ifaceSigName (IfaceSig name _ _ _) = name
338 %************************************************************************
340 \subsection{Rules in interface files}
342 %************************************************************************
345 pprHsIdInfo [] = empty
346 pprHsIdInfo info = ptext SLIT("{-##") <+> hsep (map ppr info) <+> ptext SLIT("##-}")
350 | HsStrictness StrictnessInfo
351 | HsUnfold InlinePragInfo (UfExpr name)
354 | HsWorker name -- Worker, if any
356 -- NB: Specialisations and rules come in separately and are
357 -- only later attached to the Id. Partial reason: some are orphans.
359 instance Outputable name => Outputable (HsIdInfo name) where
360 ppr (HsUnfold prag unf) = ptext SLIT("__U") <> pprInlinePragInfo prag <+> parens (ppr unf)
361 ppr (HsArity arity) = ppArityInfo arity
362 ppr (HsStrictness str) = ptext SLIT("__S") <+> ppStrictnessInfo str
363 ppr HsNoCafRefs = ptext SLIT("__C")
364 ppr HsCprInfo = ptext SLIT("__M")
365 ppr (HsWorker w) = ptext SLIT("__P") <+> ppr w