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 module IfaceType, -- Re-export all this
17 IfaceDecl(..), IfaceClassOp(..), IfaceConDecl(..), IfaceConDecls(..),
18 IfaceExpr(..), IfaceAlt, IfaceNote(..),
19 IfaceBinding(..), IfaceConAlt(..), IfaceIdInfo(..),
20 IfaceInfoItem(..), IfaceRule(..), IfaceInst(..),
26 IfaceEq(..), (&&&), bool, eqListBy, eqMaybeBy,
27 eqIfDecl, eqIfInst, eqIfRule, checkBootDecl,
30 pprIfaceExpr, pprIfaceDecl, pprIfaceDeclHead
33 #include "HsVersions.h"
38 import NewDemand ( StrictSig, pprIfaceStrictSig )
39 import TcType ( deNoteType )
40 import Class ( FunDep, DefMeth, pprFundeps )
41 import OccName ( OccName, parenSymOcc, occNameFS,
42 OccSet, unionOccSets, unitOccSet )
43 import UniqFM ( UniqFM, emptyUFM, addToUFM, lookupUFM )
44 import Name ( Name, NamedThing(..), nameOccName, isExternalName )
45 import CostCentre ( CostCentre, pprCostCentreCore )
46 import Literal ( Literal )
47 import ForeignCall ( ForeignCall )
48 import BasicTypes ( Arity, Activation(..), StrictnessMark, OverlapFlag,
49 RecFlag(..), Boxity(..),
50 isAlwaysActive, tupleParens )
53 import Maybes ( catMaybes )
54 import Util ( lengthIs )
57 infix 4 `eqIfExt`, `eqIfIdInfo`, `eqIfType`
61 %************************************************************************
63 Data type declarations
65 %************************************************************************
69 = IfaceId { ifName :: OccName,
71 ifIdInfo :: IfaceIdInfo }
73 | IfaceData { ifName :: OccName, -- Type constructor
74 ifTyVars :: [IfaceTvBndr], -- Type variables
75 ifCtxt :: IfaceContext, -- The "stupid theta"
76 ifCons :: IfaceConDecls, -- Includes new/data info
77 ifRec :: RecFlag, -- Recursive or not?
78 ifGadtSyntax :: Bool, -- True <=> declared using GADT syntax
79 ifGeneric :: Bool -- True <=> generic converter functions available
80 } -- We need this for imported data decls, since the
81 -- imported modules may have been compiled with
82 -- different flags to the current compilation unit
84 | IfaceSyn { ifName :: OccName, -- Type constructor
85 ifTyVars :: [IfaceTvBndr], -- Type variables
86 ifOpenSyn :: Bool, -- Is an open family?
87 ifSynRhs :: IfaceType -- Type for an ordinary
88 -- synonym and kind for an
92 | IfaceClass { ifCtxt :: IfaceContext, -- Context...
93 ifName :: OccName, -- Name of the class
94 ifTyVars :: [IfaceTvBndr], -- Type variables
95 ifFDs :: [FunDep FastString], -- Functional dependencies
96 ifSigs :: [IfaceClassOp], -- Method signatures
97 ifRec :: RecFlag -- Is newtype/datatype associated with the class recursive?
100 | IfaceForeign { ifName :: OccName, -- Needs expanding when we move beyond .NET
101 ifExtName :: Maybe FastString }
103 data IfaceClassOp = IfaceClassOp OccName DefMeth IfaceType
104 -- Nothing => no default method
105 -- Just False => ordinary polymorphic default method
106 -- Just True => generic default method
109 = IfAbstractTyCon -- No info
110 | IfOpenDataTyCon -- Open data family
111 | IfOpenNewTyCon -- Open newtype family
112 | IfDataTyCon [IfaceConDecl] -- data type decls
113 | IfNewTyCon IfaceConDecl -- newtype decls
115 visibleIfConDecls :: IfaceConDecls -> [IfaceConDecl]
116 visibleIfConDecls IfAbstractTyCon = []
117 visibleIfConDecls IfOpenDataTyCon = []
118 visibleIfConDecls IfOpenNewTyCon = []
119 visibleIfConDecls (IfDataTyCon cs) = cs
120 visibleIfConDecls (IfNewTyCon c) = [c]
124 ifConOcc :: OccName, -- Constructor name
125 ifConInfix :: Bool, -- True <=> declared infix
126 ifConUnivTvs :: [IfaceTvBndr], -- Universal tyvars
127 ifConExTvs :: [IfaceTvBndr], -- Existential tyvars
128 ifConEqSpec :: [(OccName,IfaceType)], -- Equality contraints
129 ifConCtxt :: IfaceContext, -- Non-stupid context
130 ifConArgTys :: [IfaceType], -- Arg types
131 ifConFields :: [OccName], -- ...ditto... (field labels)
132 ifConStricts :: [StrictnessMark] } -- Empty (meaning all lazy), or 1-1 corresp with arg types
135 = IfaceInst { ifInstCls :: IfaceExtName, -- See comments with
136 ifInstTys :: [Maybe IfaceTyCon], -- the defn of Instance
137 ifDFun :: OccName, -- The dfun
138 ifOFlag :: OverlapFlag, -- Overlap flag
139 ifInstOrph :: Maybe OccName } -- See is_orph in defn of Instance
140 -- There's always a separate IfaceDecl for the DFun, which gives
141 -- its IdInfo with its full type and version number.
142 -- The instance declarations taken together have a version number,
143 -- and we don't want that to wobble gratuitously
144 -- If this instance decl is *used*, we'll record a usage on the dfun;
145 -- and if the head does not change it won't be used if it wasn't before
149 ifRuleName :: RuleName,
150 ifActivation :: Activation,
151 ifRuleBndrs :: [IfaceBndr], -- Tyvars and term vars
152 ifRuleHead :: IfaceExtName, -- Head of lhs
153 ifRuleArgs :: [IfaceExpr], -- Args of LHS
154 ifRuleRhs :: IfaceExpr,
155 ifRuleOrph :: Maybe OccName -- Just like IfaceInst
159 = NoInfo -- When writing interface file without -O
160 | HasInfo [IfaceInfoItem] -- Has info, and here it is
162 -- Here's a tricky case:
163 -- * Compile with -O module A, and B which imports A.f
164 -- * Change function f in A, and recompile without -O
165 -- * When we read in old A.hi we read in its IdInfo (as a thunk)
166 -- (In earlier GHCs we used to drop IdInfo immediately on reading,
167 -- but we do not do that now. Instead it's discarded when the
168 -- ModIface is read into the various decl pools.)
169 -- * The version comparsion sees that new (=NoInfo) differs from old (=HasInfo *)
170 -- and so gives a new version.
174 | HsStrictness StrictSig
175 | HsInline Activation
178 | HsWorker IfaceExtName Arity -- Worker, if any see IdInfo.WorkerInfo
179 -- for why we want arity here.
180 -- NB: we need IfaceExtName (not just OccName) because the worker
181 -- can simplify to a function in another module.
182 -- NB: Specialisations and rules come in separately and are
183 -- only later attached to the Id. Partial reason: some are orphans.
185 --------------------------------
187 = IfaceLcl FastString
188 | IfaceExt IfaceExtName
189 | IfaceType IfaceType
190 | IfaceTuple Boxity [IfaceExpr] -- Saturated; type arguments omitted
191 | IfaceLam IfaceBndr IfaceExpr
192 | IfaceApp IfaceExpr IfaceExpr
193 | IfaceCase IfaceExpr FastString IfaceType [IfaceAlt]
194 | IfaceLet IfaceBinding IfaceExpr
195 | IfaceNote IfaceNote IfaceExpr
196 | IfaceCast IfaceExpr IfaceCoercion
198 | IfaceFCall ForeignCall IfaceType
200 data IfaceNote = IfaceSCC CostCentre
202 | IfaceCoreNote String
204 type IfaceAlt = (IfaceConAlt, [FastString], IfaceExpr)
205 -- Note: FastString, not IfaceBndr (and same with the case binder)
206 -- We reconstruct the kind/type of the thing from the context
207 -- thus saving bulk in interface files
209 data IfaceConAlt = IfaceDefault
210 | IfaceDataAlt OccName
211 | IfaceTupleAlt Boxity
212 | IfaceLitAlt Literal
215 = IfaceNonRec IfaceIdBndr IfaceExpr
216 | IfaceRec [(IfaceIdBndr, IfaceExpr)]
220 %************************************************************************
222 \subsection[HsCore-print]{Printing Core unfoldings}
224 %************************************************************************
226 ----------------------------- Printing IfaceDecl ------------------------------------
229 instance Outputable IfaceDecl where
232 pprIfaceDecl (IfaceId {ifName = var, ifType = ty, ifIdInfo = info})
233 = sep [ ppr var <+> dcolon <+> ppr ty,
236 pprIfaceDecl (IfaceForeign {ifName = tycon})
237 = hsep [ptext SLIT("foreign import type dotnet"), ppr tycon]
239 pprIfaceDecl (IfaceSyn {ifName = tycon, ifTyVars = tyvars,
240 ifOpenSyn = False, ifSynRhs = mono_ty})
241 = hang (ptext SLIT("type") <+> pprIfaceDeclHead [] tycon tyvars)
242 4 (equals <+> ppr mono_ty)
244 pprIfaceDecl (IfaceSyn {ifName = tycon, ifTyVars = tyvars,
245 ifOpenSyn = True, ifSynRhs = mono_ty})
246 = hang (ptext SLIT("type family") <+> pprIfaceDeclHead [] tycon tyvars)
247 4 (dcolon <+> ppr mono_ty)
249 pprIfaceDecl (IfaceData {ifName = tycon, ifGeneric = gen, ifCtxt = context,
250 ifTyVars = tyvars, ifCons = condecls,
252 = hang (pp_nd <+> pprIfaceDeclHead context tycon tyvars)
253 4 (vcat [pprRec isrec, pprGen gen, pp_condecls tycon condecls])
255 pp_nd = case condecls of
256 IfAbstractTyCon -> ptext SLIT("data")
257 IfOpenDataTyCon -> ptext SLIT("data family")
258 IfDataTyCon _ -> ptext SLIT("data")
259 IfNewTyCon _ -> ptext SLIT("newtype")
260 IfOpenNewTyCon -> ptext SLIT("newtype family")
262 pprIfaceDecl (IfaceClass {ifCtxt = context, ifName = clas, ifTyVars = tyvars,
263 ifFDs = fds, ifSigs = sigs, ifRec = isrec})
264 = hang (ptext SLIT("class") <+> pprIfaceDeclHead context clas tyvars <+> pprFundeps fds)
265 4 (vcat [pprRec isrec,
268 pprRec isrec = ptext SLIT("RecFlag") <+> ppr isrec
269 pprGen True = ptext SLIT("Generics: yes")
270 pprGen False = ptext SLIT("Generics: no")
272 instance Outputable IfaceClassOp where
273 ppr (IfaceClassOp n dm ty) = ppr n <+> ppr dm <+> dcolon <+> ppr ty
275 pprIfaceDeclHead :: IfaceContext -> OccName -> [IfaceTvBndr] -> SDoc
276 pprIfaceDeclHead context thing tyvars
277 = hsep [pprIfaceContext context, parenSymOcc thing (ppr thing), pprIfaceTvBndrs tyvars]
279 pp_condecls tc IfAbstractTyCon = ptext SLIT("{- abstract -}")
280 pp_condecls tc IfOpenNewTyCon = empty
281 pp_condecls tc (IfNewTyCon c) = equals <+> pprIfaceConDecl tc c
282 pp_condecls tc IfOpenDataTyCon = empty
283 pp_condecls tc (IfDataTyCon cs) = equals <+> sep (punctuate (ptext SLIT(" |"))
284 (map (pprIfaceConDecl tc) cs))
287 (IfCon { ifConOcc = name, ifConInfix = is_infix,
288 ifConUnivTvs = univ_tvs, ifConExTvs = ex_tvs,
289 ifConEqSpec = eq_spec, ifConCtxt = ctxt, ifConArgTys = arg_tys,
290 ifConStricts = strs, ifConFields = fields })
292 if is_infix then ptext SLIT("Infix") else empty,
293 if null strs then empty
294 else nest 4 (ptext SLIT("Stricts:") <+> hsep (map ppr strs)),
295 if null fields then empty
296 else nest 4 (ptext SLIT("Fields:") <+> hsep (map ppr fields))]
298 main_payload = ppr name <+> dcolon <+>
299 pprIfaceForAllPart (univ_tvs ++ ex_tvs) (eq_ctxt ++ ctxt) (ppr con_tau)
301 eq_ctxt = [(IfaceEqPred (IfaceTyVar (occNameFS tv)) ty)
302 | (tv,ty) <- eq_spec]
303 con_tau = foldr1 IfaceFunTy (arg_tys ++ [tc_app])
304 tc_app = IfaceTyConApp (IfaceTc (LocalTop tc))
305 [IfaceTyVar tv | (tv,_) <- univ_tvs]
306 -- Gruesome, but jsut for debug print
308 instance Outputable IfaceRule where
309 ppr (IfaceRule { ifRuleName = name, ifActivation = act, ifRuleBndrs = bndrs,
310 ifRuleHead = fn, ifRuleArgs = args, ifRuleRhs = rhs })
311 = sep [hsep [doubleQuotes (ftext name), ppr act,
312 ptext SLIT("forall") <+> pprIfaceBndrs bndrs],
313 nest 2 (sep [ppr fn <+> sep (map (pprIfaceExpr parens) args),
314 ptext SLIT("=") <+> ppr rhs])
317 instance Outputable IfaceInst where
318 ppr (IfaceInst {ifDFun = dfun_id, ifOFlag = flag,
319 ifInstCls = cls, ifInstTys = mb_tcs})
320 = hang (ptext SLIT("instance") <+> ppr flag
321 <+> ppr cls <+> brackets (pprWithCommas ppr_mb mb_tcs))
322 2 (equals <+> ppr dfun_id)
325 ppr_mb (Just tc) = ppr tc
329 ----------------------------- Printing IfaceExpr ------------------------------------
332 instance Outputable IfaceExpr where
333 ppr e = pprIfaceExpr noParens e
335 pprIfaceExpr :: (SDoc -> SDoc) -> IfaceExpr -> SDoc
336 -- The function adds parens in context that need
337 -- an atomic value (e.g. function args)
339 pprIfaceExpr add_par (IfaceLcl v) = ppr v
340 pprIfaceExpr add_par (IfaceExt v) = ppr v
341 pprIfaceExpr add_par (IfaceLit l) = ppr l
342 pprIfaceExpr add_par (IfaceFCall cc ty) = braces (ppr cc <+> ppr ty)
343 pprIfaceExpr add_par (IfaceType ty) = char '@' <+> pprParendIfaceType ty
345 pprIfaceExpr add_par app@(IfaceApp _ _) = add_par (pprIfaceApp app [])
346 pprIfaceExpr add_par (IfaceTuple c as) = tupleParens c (interpp'SP as)
348 pprIfaceExpr add_par e@(IfaceLam _ _)
349 = add_par (sep [char '\\' <+> sep (map ppr bndrs) <+> arrow,
350 pprIfaceExpr noParens body])
352 (bndrs,body) = collect [] e
353 collect bs (IfaceLam b e) = collect (b:bs) e
354 collect bs e = (reverse bs, e)
357 pprIfaceExpr add_par (IfaceCase scrut bndr ty [(con, bs, rhs)])
359 = add_par (sep [ptext SLIT("case") <+> char '@' <+> pprParendIfaceType ty <+> pprIfaceExpr noParens scrut <+> ptext SLIT("of")
360 <+> ppr bndr <+> char '{' <+> ppr_con_bs con bs <+> arrow,
361 pprIfaceExpr noParens rhs <+> char '}'])
364 pprIfaceExpr add_par (IfaceCase scrut bndr ty alts)
366 = add_par (sep [ptext SLIT("case") <+> char '@' <+> pprParendIfaceType ty <+> pprIfaceExpr noParens scrut <+> ptext SLIT("of")
367 <+> ppr bndr <+> char '{',
368 nest 2 (sep (map ppr_alt alts)) <+> char '}'])
370 pprIfaceExpr add_par (IfaceCast expr co) = add_par (ptext SLIT("cast") <+> ppr expr <+> ppr co)
372 pprIfaceExpr add_par (IfaceLet (IfaceNonRec b rhs) body)
373 = add_par (sep [ptext SLIT("let {"),
374 nest 2 (ppr_bind (b, rhs)),
376 pprIfaceExpr noParens body])
378 pprIfaceExpr add_par (IfaceLet (IfaceRec pairs) body)
379 = add_par (sep [ptext SLIT("letrec {"),
380 nest 2 (sep (map ppr_bind pairs)),
382 pprIfaceExpr noParens body])
384 pprIfaceExpr add_par (IfaceNote note body) = add_par (ppr note <+> pprIfaceExpr parens body)
386 ppr_alt (con, bs, rhs) = sep [ppr_con_bs con bs,
387 arrow <+> pprIfaceExpr noParens rhs]
389 ppr_con_bs (IfaceTupleAlt tup_con) bs = tupleParens tup_con (interpp'SP bs)
390 ppr_con_bs con bs = ppr con <+> hsep (map ppr bs)
392 ppr_bind ((b,ty),rhs) = sep [ppr b <+> dcolon <+> ppr ty,
393 equals <+> pprIfaceExpr noParens rhs]
396 pprIfaceApp (IfaceApp fun arg) args = pprIfaceApp fun (nest 2 (pprIfaceExpr parens arg) : args)
397 pprIfaceApp fun args = sep (pprIfaceExpr parens fun : args)
400 instance Outputable IfaceNote where
401 ppr (IfaceSCC cc) = pprCostCentreCore cc
402 ppr IfaceInlineMe = ptext SLIT("__inline_me")
403 ppr (IfaceCoreNote s) = ptext SLIT("__core_note") <+> pprHsString (mkFastString s)
405 instance Outputable IfaceConAlt where
406 ppr IfaceDefault = text "DEFAULT"
407 ppr (IfaceLitAlt l) = ppr l
408 ppr (IfaceDataAlt d) = ppr d
409 ppr (IfaceTupleAlt b) = panic "ppr IfaceConAlt"
410 -- IfaceTupleAlt is handled by the case-alternative printer
413 instance Outputable IfaceIdInfo where
415 ppr (HasInfo is) = ptext SLIT("{-") <+> fsep (map ppr_hs_info is) <+> ptext SLIT("-}")
417 ppr_hs_info (HsUnfold unf) = ptext SLIT("Unfolding:") <+>
418 parens (pprIfaceExpr noParens unf)
419 ppr_hs_info (HsInline act) = ptext SLIT("Inline:") <+> ppr act
420 ppr_hs_info (HsArity arity) = ptext SLIT("Arity:") <+> int arity
421 ppr_hs_info (HsStrictness str) = ptext SLIT("Strictness:") <+> pprIfaceStrictSig str
422 ppr_hs_info HsNoCafRefs = ptext SLIT("HasNoCafRefs")
423 ppr_hs_info (HsWorker w a) = ptext SLIT("Worker:") <+> ppr w <+> int a
427 %************************************************************************
429 Equality, for interface file version generaion only
431 %************************************************************************
433 Equality over IfaceSyn returns an IfaceEq, not a Bool. The new constructor is
434 EqBut, which gives the set of *locally-defined* things whose version must be equal
435 for the whole thing to be equal. So the key function is eqIfExt, which compares
438 Of course, equality is also done modulo alpha conversion.
442 = Equal -- Definitely exactly the same
443 | NotEqual -- Definitely different
444 | EqBut OccSet -- The same provided these local things have not changed
446 bool :: Bool -> IfaceEq
448 bool False = NotEqual
450 toBool :: IfaceEq -> Bool
452 toBool (EqBut _) = True
453 toBool NotEqual = False
455 zapEq :: IfaceEq -> IfaceEq -- Used to forget EqBut information
456 zapEq (EqBut _) = Equal
459 (&&&) :: IfaceEq -> IfaceEq -> IfaceEq
461 NotEqual &&& x = NotEqual
462 EqBut occs &&& Equal = EqBut occs
463 EqBut occs &&& NotEqual = NotEqual
464 EqBut occs1 &&& EqBut occs2 = EqBut (occs1 `unionOccSets` occs2)
466 ---------------------
467 eqIfExt :: IfaceExtName -> IfaceExtName -> IfaceEq
468 -- This function is the core of the EqBut stuff
469 eqIfExt (ExtPkg mod1 occ1) (ExtPkg mod2 occ2) = bool (mod1==mod2 && occ1==occ2)
470 eqIfExt (HomePkg mod1 occ1 v1) (HomePkg mod2 occ2 v2) = bool (mod1==mod2 && occ1==occ2 && v1==v2)
471 eqIfExt (LocalTop occ1) (LocalTop occ2) | occ1 == occ2 = EqBut (unitOccSet occ1)
472 eqIfExt (LocalTopSub occ1 p1) (LocalTop occ2) | occ1 == occ2 = EqBut (unitOccSet p1)
473 eqIfExt (LocalTopSub occ1 p1) (LocalTopSub occ2 _) | occ1 == occ2 = EqBut (unitOccSet p1)
474 eqIfExt n1 n2 = NotEqual
479 ---------------------
480 checkBootDecl :: IfaceDecl -- The boot decl
481 -> IfaceDecl -- The real decl
482 -> Bool -- True <=> compatible
483 checkBootDecl (IfaceId s1 t1 _) (IfaceId s2 t2 _)
484 = ASSERT( s1==s2 ) toBool (t1 `eqIfType` t2)
486 checkBootDecl d1@(IfaceForeign {}) d2@(IfaceForeign {})
487 = ASSERT (ifName d1 == ifName d2 ) ifExtName d1 == ifExtName d2
489 checkBootDecl d1@(IfaceSyn {}) d2@(IfaceSyn {})
490 = ASSERT( ifName d1 == ifName d2 )
491 toBool $ eqWith (ifTyVars d1) (ifTyVars d2) $ \ env ->
492 eq_ifType env (ifSynRhs d1) (ifSynRhs d2)
494 checkBootDecl d1@(IfaceData {}) d2@(IfaceData {})
495 -- We don't check the recursion flags because the boot-one is
496 -- recursive, to be conservative, but the real one may not be.
497 -- I'm not happy with the way recursive flags are dealt with.
498 = ASSERT( ifName d1 == ifName d2 )
499 toBool $ eqWith (ifTyVars d1) (ifTyVars d2) $ \ env ->
500 eq_ifContext env (ifCtxt d1) (ifCtxt d2) &&&
502 IfAbstractTyCon -> Equal
503 cons1 -> eq_hsCD env cons1 (ifCons d2)
505 checkBootDecl d1@(IfaceClass {}) d2@(IfaceClass {})
506 = ASSERT( ifName d1 == ifName d2 )
507 toBool $ eqWith (ifTyVars d1) (ifTyVars d2) $ \ env ->
508 eqListBy (eq_hsFD env) (ifFDs d1) (ifFDs d2) &&&
509 case (ifCtxt d1, ifSigs d1) of
511 (cxt1, sigs1) -> eq_ifContext env cxt1 (ifCtxt d2) &&&
512 eqListBy (eq_cls_sig env) sigs1 (ifSigs d2)
514 checkBootDecl _ _ = False -- default case
516 ---------------------
517 eqIfDecl :: IfaceDecl -> IfaceDecl -> IfaceEq
518 eqIfDecl (IfaceId s1 t1 i1) (IfaceId s2 t2 i2)
519 = bool (s1 == s2) &&& (t1 `eqIfType` t2) &&& (i1 `eqIfIdInfo` i2)
521 eqIfDecl d1@(IfaceForeign {}) d2@(IfaceForeign {})
522 = bool (ifName d1 == ifName d2 && ifExtName d1 == ifExtName d2)
524 eqIfDecl d1@(IfaceData {}) d2@(IfaceData {})
525 = bool (ifName d1 == ifName d2 &&
526 ifRec d1 == ifRec d2 &&
527 ifGadtSyntax d1 == ifGadtSyntax d2 &&
528 ifGeneric d1 == ifGeneric d2) &&&
529 eqWith (ifTyVars d1) (ifTyVars d2) (\ env ->
530 eq_ifContext env (ifCtxt d1) (ifCtxt d2) &&&
531 eq_hsCD env (ifCons d1) (ifCons d2)
533 -- The type variables of the data type do not scope
534 -- over the constructors (any more), but they do scope
535 -- over the stupid context in the IfaceConDecls
537 eqIfDecl d1@(IfaceSyn {}) d2@(IfaceSyn {})
538 = bool (ifName d1 == ifName d2) &&&
539 eqWith (ifTyVars d1) (ifTyVars d2) (\ env ->
540 eq_ifType env (ifSynRhs d1) (ifSynRhs d2)
543 eqIfDecl d1@(IfaceClass {}) d2@(IfaceClass {})
544 = bool (ifName d1 == ifName d2 &&
545 ifRec d1 == ifRec d2) &&&
546 eqWith (ifTyVars d1) (ifTyVars d2) (\ env ->
547 eq_ifContext env (ifCtxt d1) (ifCtxt d2) &&&
548 eqListBy (eq_hsFD env) (ifFDs d1) (ifFDs d2) &&&
549 eqListBy (eq_cls_sig env) (ifSigs d1) (ifSigs d2)
552 eqIfDecl _ _ = NotEqual -- default case
555 eqWith :: [IfaceTvBndr] -> [IfaceTvBndr] -> (EqEnv -> IfaceEq) -> IfaceEq
556 eqWith = eq_ifTvBndrs emptyEqEnv
558 -----------------------
559 eqIfInst d1 d2 = bool (ifDFun d1 == ifDFun d2 && ifOFlag d1 == ifOFlag d2)
560 -- All other changes are handled via the version info on the dfun
562 eqIfRule (IfaceRule n1 a1 bs1 f1 es1 rhs1 o1)
563 (IfaceRule n2 a2 bs2 f2 es2 rhs2 o2)
564 = bool (n1==n2 && a1==a2 && o1 == o2) &&&
566 eq_ifBndrs emptyEqEnv bs1 bs2 (\env ->
567 zapEq (eqListBy (eq_ifaceExpr env) es1 es2) &&&
568 -- zapEq: for the LHSs, ignore the EqBut part
569 eq_ifaceExpr env rhs1 rhs2)
571 eq_hsCD env (IfDataTyCon c1) (IfDataTyCon c2)
572 = eqListBy (eq_ConDecl env) c1 c2
574 eq_hsCD env (IfNewTyCon c1) (IfNewTyCon c2) = eq_ConDecl env c1 c2
575 eq_hsCD env IfAbstractTyCon IfAbstractTyCon = Equal
576 eq_hsCD env IfOpenDataTyCon IfOpenDataTyCon = Equal
577 eq_hsCD env IfOpenNewTyCon IfOpenNewTyCon = Equal
578 eq_hsCD env d1 d2 = NotEqual
581 = bool (ifConOcc c1 == ifConOcc c2 &&
582 ifConInfix c1 == ifConInfix c2 &&
583 ifConStricts c1 == ifConStricts c2 &&
584 ifConFields c1 == ifConFields c2) &&&
585 eq_ifTvBndrs env (ifConUnivTvs c1) (ifConUnivTvs c2) (\ env ->
586 eq_ifTvBndrs env (ifConExTvs c1) (ifConExTvs c2) (\ env ->
587 eq_ifContext env (ifConCtxt c1) (ifConCtxt c2) &&&
588 eq_ifTypes env (ifConArgTys c1) (ifConArgTys c2)))
590 eq_hsFD env (ns1,ms1) (ns2,ms2)
591 = eqListBy (eqIfOcc env) ns1 ns2 &&& eqListBy (eqIfOcc env) ms1 ms2
593 eq_cls_sig env (IfaceClassOp n1 dm1 ty1) (IfaceClassOp n2 dm2 ty2)
594 = bool (n1==n2 && dm1 == dm2) &&& eq_ifType env ty1 ty2
600 eqIfIdInfo NoInfo NoInfo = Equal
601 eqIfIdInfo (HasInfo is1) (HasInfo is2) = eqListBy eq_item is1 is2
602 eqIfIdInfo i1 i2 = NotEqual
604 eq_item (HsInline a1) (HsInline a2) = bool (a1 == a2)
605 eq_item (HsArity a1) (HsArity a2) = bool (a1 == a2)
606 eq_item (HsStrictness s1) (HsStrictness s2) = bool (s1 == s2)
607 eq_item (HsUnfold u1) (HsUnfold u2) = eq_ifaceExpr emptyEqEnv u1 u2
608 eq_item HsNoCafRefs HsNoCafRefs = Equal
609 eq_item (HsWorker wkr1 a1) (HsWorker wkr2 a2) = bool (a1==a2) &&& (wkr1 `eqIfExt` wkr2)
610 eq_item _ _ = NotEqual
613 eq_ifaceExpr :: EqEnv -> IfaceExpr -> IfaceExpr -> IfaceEq
614 eq_ifaceExpr env (IfaceLcl v1) (IfaceLcl v2) = eqIfOcc env v1 v2
615 eq_ifaceExpr env (IfaceExt v1) (IfaceExt v2) = eqIfExt v1 v2
616 eq_ifaceExpr env (IfaceLit l1) (IfaceLit l2) = bool (l1 == l2)
617 eq_ifaceExpr env (IfaceFCall c1 ty1) (IfaceFCall c2 ty2) = bool (c1==c2) &&& eq_ifType env ty1 ty2
618 eq_ifaceExpr env (IfaceType ty1) (IfaceType ty2) = eq_ifType env ty1 ty2
619 eq_ifaceExpr env (IfaceTuple n1 as1) (IfaceTuple n2 as2) = bool (n1==n2) &&& eqListBy (eq_ifaceExpr env) as1 as2
620 eq_ifaceExpr env (IfaceLam b1 body1) (IfaceLam b2 body2) = eq_ifBndr env b1 b2 (\env -> eq_ifaceExpr env body1 body2)
621 eq_ifaceExpr env (IfaceApp f1 a1) (IfaceApp f2 a2) = eq_ifaceExpr env f1 f2 &&& eq_ifaceExpr env a1 a2
622 eq_ifaceExpr env (IfaceCast e1 co1) (IfaceCast e2 co2) = eq_ifaceExpr env e1 e2 &&& eq_ifType env co1 co2
623 eq_ifaceExpr env (IfaceNote n1 r1) (IfaceNote n2 r2) = eq_ifaceNote env n1 n2 &&& eq_ifaceExpr env r1 r2
625 eq_ifaceExpr env (IfaceCase s1 b1 ty1 as1) (IfaceCase s2 b2 ty2 as2)
626 = eq_ifaceExpr env s1 s2 &&&
627 eq_ifType env ty1 ty2 &&&
628 eq_ifNakedBndr env b1 b2 (\env -> eqListBy (eq_ifaceAlt env) as1 as2)
630 eq_ifaceAlt env (c1,bs1,r1) (c2,bs2,r2)
631 = bool (eq_ifaceConAlt c1 c2) &&&
632 eq_ifNakedBndrs env bs1 bs2 (\env -> eq_ifaceExpr env r1 r2)
634 eq_ifaceExpr env (IfaceLet (IfaceNonRec b1 r1) x1) (IfaceLet (IfaceNonRec b2 r2) x2)
635 = eq_ifaceExpr env r1 r2 &&& eq_ifIdBndr env b1 b2 (\env -> eq_ifaceExpr env x1 x2)
637 eq_ifaceExpr env (IfaceLet (IfaceRec as1) x1) (IfaceLet (IfaceRec as2) x2)
638 = eq_ifIdBndrs env bs1 bs2 (\env -> eqListBy (eq_ifaceExpr env) rs1 rs2 &&& eq_ifaceExpr env x1 x2)
640 (bs1,rs1) = unzip as1
641 (bs2,rs2) = unzip as2
644 eq_ifaceExpr env _ _ = NotEqual
647 eq_ifaceConAlt :: IfaceConAlt -> IfaceConAlt -> Bool
648 eq_ifaceConAlt IfaceDefault IfaceDefault = True
649 eq_ifaceConAlt (IfaceDataAlt n1) (IfaceDataAlt n2) = n1==n2
650 eq_ifaceConAlt (IfaceTupleAlt c1) (IfaceTupleAlt c2) = c1==c2
651 eq_ifaceConAlt (IfaceLitAlt l1) (IfaceLitAlt l2) = l1==l2
652 eq_ifaceConAlt _ _ = False
655 eq_ifaceNote :: EqEnv -> IfaceNote -> IfaceNote -> IfaceEq
656 eq_ifaceNote env (IfaceSCC c1) (IfaceSCC c2) = bool (c1==c2)
657 eq_ifaceNote env IfaceInlineMe IfaceInlineMe = Equal
658 eq_ifaceNote env (IfaceCoreNote s1) (IfaceCoreNote s2) = bool (s1==s2)
659 eq_ifaceNote env _ _ = NotEqual
663 ---------------------
664 eqIfType t1 t2 = eq_ifType emptyEqEnv t1 t2
667 eq_ifType env (IfaceTyVar n1) (IfaceTyVar n2) = eqIfOcc env n1 n2
668 eq_ifType env (IfaceAppTy s1 t1) (IfaceAppTy s2 t2) = eq_ifType env s1 s2 &&& eq_ifType env t1 t2
669 eq_ifType env (IfacePredTy st1) (IfacePredTy st2) = eq_ifPredType env st1 st2
670 eq_ifType env (IfaceTyConApp tc1 ts1) (IfaceTyConApp tc2 ts2) = tc1 `eqIfTc` tc2 &&& eq_ifTypes env ts1 ts2
671 eq_ifType env (IfaceForAllTy tv1 t1) (IfaceForAllTy tv2 t2) = eq_ifTvBndr env tv1 tv2 (\env -> eq_ifType env t1 t2)
672 eq_ifType env (IfaceFunTy s1 t1) (IfaceFunTy s2 t2) = eq_ifType env s1 s2 &&& eq_ifType env t1 t2
673 eq_ifType env _ _ = NotEqual
676 eq_ifTypes env = eqListBy (eq_ifType env)
679 eq_ifContext env a b = eqListBy (eq_ifPredType env) a b
682 eq_ifPredType env (IfaceClassP c1 tys1) (IfaceClassP c2 tys2) = c1 `eqIfExt` c2 &&& eq_ifTypes env tys1 tys2
683 eq_ifPredType env (IfaceIParam n1 ty1) (IfaceIParam n2 ty2) = bool (n1 == n2) &&& eq_ifType env ty1 ty2
684 eq_ifPredType env _ _ = NotEqual
687 eqIfTc (IfaceTc tc1) (IfaceTc tc2) = tc1 `eqIfExt` tc2
688 eqIfTc IfaceIntTc IfaceIntTc = Equal
689 eqIfTc IfaceCharTc IfaceCharTc = Equal
690 eqIfTc IfaceBoolTc IfaceBoolTc = Equal
691 eqIfTc IfaceListTc IfaceListTc = Equal
692 eqIfTc IfacePArrTc IfacePArrTc = Equal
693 eqIfTc (IfaceTupTc bx1 ar1) (IfaceTupTc bx2 ar2) = bool (bx1==bx2 && ar1==ar2)
694 eqIfTc _ _ = NotEqual
697 -----------------------------------------------------------
698 Support code for equality checking
699 -----------------------------------------------------------
702 ------------------------------------
703 type EqEnv = UniqFM FastString -- Tracks the mapping from L-variables to R-variables
705 eqIfOcc :: EqEnv -> FastString -> FastString -> IfaceEq
706 eqIfOcc env n1 n2 = case lookupUFM env n1 of
707 Just n1 -> bool (n1 == n2)
708 Nothing -> bool (n1 == n2)
710 extendEqEnv :: EqEnv -> FastString -> FastString -> EqEnv
711 extendEqEnv env n1 n2 | n1 == n2 = env
712 | otherwise = addToUFM env n1 n2
715 emptyEqEnv = emptyUFM
717 ------------------------------------
718 type ExtEnv bndr = EqEnv -> bndr -> bndr -> (EqEnv -> IfaceEq) -> IfaceEq
720 eq_ifNakedBndr :: ExtEnv FastString
721 eq_ifBndr :: ExtEnv IfaceBndr
722 eq_ifTvBndr :: ExtEnv IfaceTvBndr
723 eq_ifIdBndr :: ExtEnv IfaceIdBndr
725 eq_ifNakedBndr env n1 n2 k = k (extendEqEnv env n1 n2)
727 eq_ifBndr env (IfaceIdBndr b1) (IfaceIdBndr b2) k = eq_ifIdBndr env b1 b2 k
728 eq_ifBndr env (IfaceTvBndr b1) (IfaceTvBndr b2) k = eq_ifTvBndr env b1 b2 k
729 eq_ifBndr _ _ _ _ = NotEqual
731 eq_ifTvBndr env (v1, k1) (v2, k2) k = eq_ifType env k1 k2 &&& k (extendEqEnv env v1 v2)
732 eq_ifIdBndr env (v1, t1) (v2, t2) k = eq_ifType env t1 t2 &&& k (extendEqEnv env v1 v2)
734 eq_ifBndrs :: ExtEnv [IfaceBndr]
735 eq_ifIdBndrs :: ExtEnv [IfaceIdBndr]
736 eq_ifTvBndrs :: ExtEnv [IfaceTvBndr]
737 eq_ifNakedBndrs :: ExtEnv [FastString]
738 eq_ifBndrs = eq_bndrs_with eq_ifBndr
739 eq_ifIdBndrs = eq_bndrs_with eq_ifIdBndr
740 eq_ifTvBndrs = eq_bndrs_with eq_ifTvBndr
741 eq_ifNakedBndrs = eq_bndrs_with eq_ifNakedBndr
743 eq_bndrs_with eq env [] [] k = k env
744 eq_bndrs_with eq env (b1:bs1) (b2:bs2) k = eq env b1 b2 (\env -> eq_bndrs_with eq env bs1 bs2 k)
745 eq_bndrs_with eq env _ _ _ = NotEqual
749 eqListBy :: (a->a->IfaceEq) -> [a] -> [a] -> IfaceEq
750 eqListBy eq [] [] = Equal
751 eqListBy eq (x:xs) (y:ys) = eq x y &&& eqListBy eq xs ys
752 eqListBy eq xs ys = NotEqual
754 eqMaybeBy :: (a->a->IfaceEq) -> Maybe a -> Maybe a -> IfaceEq
755 eqMaybeBy eq Nothing Nothing = Equal
756 eqMaybeBy eq (Just x) (Just y) = eq x y
757 eqMaybeBy eq x y = NotEqual