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,
24 #include "HsVersions.h"
27 import HsTypes ( HsType, pprParendHsType, pprHsTyVarBndr, toHsType,
28 HsTupCon(..), hsTupParens,
29 emptyEqHsEnv, extendEqHsEnv, eqListBy,
30 eq_hsType, eq_hsVar, eq_hsVars
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, getName )
41 import CostCentre ( pprCostCentreCore )
42 import PrimOp ( PrimOp(CCallOp) )
43 import Demand ( StrictnessInfo )
44 import Literal ( Literal, maybeLitLit )
45 import PrimOp ( CCall, pprCCallOp )
46 import DataCon ( dataConTyCon )
47 import TyCon ( isTupleTyCon, tupleTyConBoxity )
50 import SrcLoc ( SrcLoc )
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 | UfCCall CCall (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
98 %************************************************************************
100 \subsection{Converting from Core to UfCore}
102 %************************************************************************
105 toUfExpr :: CoreExpr -> UfExpr Name
106 toUfExpr (Var v) = toUfVar v
107 toUfExpr (Lit l) = case maybeLitLit l of
108 Just (s,ty) -> UfLitLit s (toHsType ty)
110 toUfExpr (Type ty) = UfType (toHsType ty)
111 toUfExpr (Lam x b) = UfLam (toUfBndr x) (toUfExpr b)
112 toUfExpr (App f a) = toUfApp f [a]
113 toUfExpr (Case s x as) = UfCase (toUfExpr s) (getName x) (map toUfAlt as)
114 toUfExpr (Let b e) = UfLet (toUfBind b) (toUfExpr e)
115 toUfExpr (Note n e) = UfNote (toUfNote n) (toUfExpr e)
117 ---------------------
118 toUfNote (SCC cc) = UfSCC cc
119 toUfNote (Coerce t1 _) = UfCoerce (toHsType t1)
120 toUfNote InlineCall = UfInlineCall
121 toUfNote InlineMe = UfInlineMe
123 ---------------------
124 toUfBind (NonRec b r) = UfNonRec (toUfBndr b) (toUfExpr r)
125 toUfBind (Rec prs) = UfRec [(toUfBndr b, toUfExpr r) | (b,r) <- prs]
127 ---------------------
128 toUfAlt (c,bs,r) = (toUfCon c, map getName bs, toUfExpr r)
130 ---------------------
131 toUfCon (DataAlt dc) | isTupleTyCon tc = UfTupleAlt (HsTupCon (getName dc) (tupleTyConBoxity tc))
132 | otherwise = UfDataAlt (getName dc)
136 toUfCon (LitAlt l) = case maybeLitLit l of
137 Just (s,ty) -> UfLitLitAlt s (toHsType ty)
138 Nothing -> UfLitAlt l
139 toUfCon DEFAULT = UfDefault
141 ---------------------
142 toUfBndr x | isId x = UfValBinder (getName x) (toHsType (varType x))
143 | otherwise = UfTyBinder (getName x) (varType x)
145 ---------------------
146 toUfApp (App f a) as = toUfApp f (a:as)
148 = case isDataConId_maybe v of
149 -- We convert the *worker* for tuples into UfTuples
150 Just dc | isTupleTyCon tc && saturated -> UfTuple (HsTupCon (getName dc) (tupleTyConBoxity tc)) tup_args
152 val_args = dropWhile isTypeArg as
153 saturated = length val_args == idArity v
154 tup_args = map toUfExpr val_args
158 other -> mkUfApps (toUfVar v) as
160 toUfApp e as = mkUfApps (toUfExpr e) as
162 mkUfApps = foldl (\f a -> UfApp f (toUfExpr a))
164 ---------------------
165 toUfVar v = case isPrimOpId_maybe v of
166 -- Ccalls has special syntax
167 Just (CCallOp cc) -> UfCCall cc (toHsType (idType v))
168 other -> UfVar (getName v)
172 %************************************************************************
174 \subsection[HsCore-print]{Printing Core unfoldings}
176 %************************************************************************
179 instance Outputable name => Outputable (UfExpr name) where
180 ppr e = pprUfExpr noParens e
182 noParens :: SDoc -> SDoc
185 pprUfExpr :: Outputable name => (SDoc -> SDoc) -> UfExpr name -> SDoc
186 -- The function adds parens in context that need
187 -- an atomic value (e.g. function args)
189 pprUfExpr add_par (UfVar v) = ppr v
190 pprUfExpr add_par (UfLit l) = ppr l
191 pprUfExpr add_par (UfLitLit l ty) = add_par (hsep [ptext SLIT("__litlit"), pprHsString l, pprParendHsType ty])
192 pprUfExpr add_par (UfCCall cc ty) = braces (pprCCallOp cc <+> ppr ty)
193 pprUfExpr add_par (UfType ty) = char '@' <+> pprParendHsType ty
195 pprUfExpr add_par e@(UfLam _ _) = add_par (char '\\' <+> hsep (map ppr bndrs)
196 <+> ptext SLIT("->") <+> pprUfExpr noParens body)
197 where (bndrs,body) = collectUfBndrs e
198 pprUfExpr add_par (UfApp fun arg) = add_par (pprUfExpr noParens fun <+> pprUfExpr parens arg)
199 pprUfExpr add_par (UfTuple c as) = hsTupParens c (interpp'SP as)
201 pprUfExpr add_par (UfCase scrut bndr alts)
202 = add_par (hsep [ptext SLIT("case"), pprUfExpr noParens scrut, ptext SLIT("of"), ppr bndr,
203 braces (hsep (map pp_alt alts))])
205 pp_alt (UfTupleAlt tup_con, bs, rhs) = hsTupParens tup_con (interpp'SP bs) <+> ppr_rhs rhs
206 pp_alt (c, bs, rhs) = ppr c <+> interppSP bs <+> ppr_rhs rhs
208 ppr_rhs rhs = ptext SLIT("->") <+> pprUfExpr noParens rhs <> semi
210 pprUfExpr add_par (UfLet (UfNonRec b rhs) body)
211 = add_par (hsep [ptext SLIT("let"),
212 braces (ppr b <+> equals <+> pprUfExpr noParens rhs),
213 ptext SLIT("in"), pprUfExpr noParens body])
215 pprUfExpr add_par (UfLet (UfRec pairs) body)
216 = add_par (hsep [ptext SLIT("__letrec"), braces (hsep (map pp_pair pairs)),
217 ptext SLIT("in"), pprUfExpr noParens body])
219 pp_pair (b,rhs) = ppr b <+> equals <+> pprUfExpr noParens rhs <> semi
221 pprUfExpr add_par (UfNote note body) = add_par (ppr note <+> pprUfExpr parens body)
223 collectUfBndrs :: UfExpr name -> ([UfBinder name], UfExpr name)
227 go bs (UfLam b e) = go (b:bs) e
228 go bs e = (reverse bs, e)
230 instance Outputable name => Outputable (UfNote name) where
231 ppr (UfSCC cc) = pprCostCentreCore cc
232 ppr (UfCoerce ty) = ptext SLIT("__coerce") <+> pprParendHsType ty
233 ppr UfInlineCall = ptext SLIT("__inline_call")
234 ppr UfInlineMe = ptext SLIT("__inline_me")
236 instance Outputable name => Outputable (UfConAlt name) where
237 ppr UfDefault = text "__DEFAULT"
238 ppr (UfLitAlt l) = ppr l
239 ppr (UfLitLitAlt l ty) = parens (hsep [ptext SLIT("__litlit"), pprHsString l, pprParendHsType ty])
240 ppr (UfDataAlt d) = ppr d
242 instance Outputable name => Outputable (UfBinder name) where
243 ppr (UfValBinder name ty) = hsep [ppr name, dcolon, pprParendHsType ty]
244 ppr (UfTyBinder name kind) = char '@' <+> pprHsTyVarBndr name kind
248 %************************************************************************
250 \subsection[HsCore-print]{Equality, for interface file checking
252 %************************************************************************
255 instance Ord name => Eq (UfExpr name) where
256 (==) a b = eq_ufExpr emptyEqHsEnv a b
259 eq_ufBinder env (UfValBinder n1 t1) (UfValBinder n2 t2) k
260 = eq_hsType env t1 t2 && k (extendEqHsEnv env n1 n2)
261 eq_ufBinder env (UfTyBinder n1 k1) (UfTyBinder n2 k2) k
262 = k1==k2 && k (extendEqHsEnv env n1 n2)
263 eq_ufBinder _ _ _ _ = False
266 eq_ufBinders env [] [] k = k env
267 eq_ufBinders env (b1:bs1) (b2:bs2) k = eq_ufBinder env b1 b2 (\env -> eq_ufBinders env bs1 bs2 k)
268 eq_ufBinders env _ _ _ = False
271 eq_ufExpr env (UfVar v1) (UfVar v2) = eq_hsVar env v1 v2
272 eq_ufExpr env (UfLit l1) (UfLit l2) = l1 == l2
273 eq_ufExpr env (UfLitLit l1 ty1) (UfLitLit l2 ty2) = l1==l2 && eq_hsType env ty1 ty2
274 eq_ufExpr env (UfCCall c1 ty1) (UfCCall c2 ty2) = c1==c2 && eq_hsType env ty1 ty2
275 eq_ufExpr env (UfType ty1) (UfType ty2) = eq_hsType env ty1 ty2
276 eq_ufExpr env (UfTuple n1 as1) (UfTuple n2 as2) = n1==n2 && eqListBy (eq_ufExpr env) as1 as2
277 eq_ufExpr env (UfLam b1 body1) (UfLam b2 body2) = eq_ufBinder env b1 b2 (\env -> eq_ufExpr env body1 body2)
278 eq_ufExpr env (UfApp f1 a1) (UfApp f2 a2) = eq_ufExpr env f1 f2 && eq_ufExpr env a1 a2
280 eq_ufExpr env (UfCase s1 b1 as1) (UfCase s2 b2 as2)
281 = eq_ufExpr env s1 s2 &&
282 eqListBy (eq_ufAlt (extendEqHsEnv env b1 b2)) as1 as2
284 eq_ufAlt env (c1,bs1,r1) (c2,bs2,r2)
285 = eq_ufConAlt env c1 c2 && eq_hsVars env bs1 bs2 (\env -> eq_ufExpr env r1 r2)
287 eq_ufExpr env (UfLet (UfNonRec b1 r1) x1) (UfLet (UfNonRec b2 r2) x2)
288 = eq_ufExpr env r1 r2 && eq_ufBinder env b1 b2 (\env -> eq_ufExpr env x1 x2)
290 eq_ufExpr env (UfLet (UfRec as1) x1) (UfLet (UfRec as2) x2)
291 = eq_ufBinders env bs1 bs2 (\env -> eqListBy (eq_ufExpr env) rs1 rs2 && eq_ufExpr env x1 x2)
293 (bs1,rs1) = unzip as1
294 (bs2,rs2) = unzip as2
296 eq_ufExpr env (UfNote n1 r1) (UfNote n2 r2)
297 = eq_ufNote n1 n2 && eq_ufExpr env r1 r2
299 eq_ufNote (UfSCC c1) (UfSCC c2) = c1==c2
300 eq_ufNote (UfCoerce t1) (UfCoerce t2) = eq_hsType env t1 t2
301 eq_ufNote UfInlineCall UfInlineCall = True
302 eq_ufNote UfInlineMe UfInlineMe = True
303 eq_ufNote _ _ = False
305 eq_ufExpr env _ _ = False
308 eq_ufConAlt env UfDefault UfDefault = True
309 eq_ufConAlt env (UfDataAlt n1) (UfDataAlt n2) = n1==n2
310 eq_ufConAlt env (UfTupleAlt c1) (UfTupleAlt c2) = c1==c2
311 eq_ufConAlt env (UfLitAlt l1) (UfLitAlt l2) = l1==l2
312 eq_ufConAlt env (UfLitLitAlt s1 t1) (UfLitLitAlt s2 t2) = s1==s2 && eq_hsType env t1 t2
313 eq_ufConAlt env _ _ = False
317 %************************************************************************
319 \subsection{Rules in interface files}
321 %************************************************************************
324 pprHsIdInfo [] = empty
325 pprHsIdInfo info = ptext SLIT("{-##") <+> hsep (map ppr info) <+> ptext SLIT("##-}")
329 | HsStrictness StrictnessInfo
330 | HsUnfold InlinePragInfo (UfExpr name)
333 | HsWorker name -- Worker, if any
335 -- NB: Specialisations and rules come in separately and are
336 -- only later attached to the Id. Partial reason: some are orphans.
338 instance Outputable name => Outputable (HsIdInfo name) where
339 ppr (HsUnfold prag unf) = ptext SLIT("__U") <> pprInlinePragInfo prag <+> parens (ppr unf)
340 ppr (HsArity arity) = ppArityInfo arity
341 ppr (HsStrictness str) = ptext SLIT("__S") <+> ppStrictnessInfo str
342 ppr HsNoCafRefs = ptext SLIT("__C")
343 ppr HsCprInfo = ptext SLIT("__M")
344 ppr (HsWorker w) = ptext SLIT("__P") <+> ppr w