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(..), IfaceFamInst(..),
23 visibleIfConDecls, extractIfFamInsts,
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, occSetElts )
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
80 ifGeneric :: Bool, -- True <=> generic converter
81 -- functions available
82 -- We need this for imported
83 -- data decls, since the
84 -- imported modules may have
86 -- different flags to the
87 -- current compilation unit
88 ifFamInst :: Maybe IfaceFamInst
89 -- Just <=> instance of family
92 | IfaceSyn { ifName :: OccName, -- Type constructor
93 ifTyVars :: [IfaceTvBndr], -- Type variables
94 ifOpenSyn :: Bool, -- Is an open family?
95 ifSynRhs :: IfaceType -- Type for an ordinary
96 -- synonym and kind for an
100 | IfaceClass { ifCtxt :: IfaceContext, -- Context...
101 ifName :: OccName, -- Name of the class
102 ifTyVars :: [IfaceTvBndr], -- Type variables
103 ifFDs :: [FunDep FastString], -- Functional dependencies
104 ifATs :: [IfaceDecl], -- Associated type families
105 ifSigs :: [IfaceClassOp], -- Method signatures
106 ifRec :: RecFlag -- Is newtype/datatype associated with the class recursive?
109 | IfaceForeign { ifName :: OccName, -- Needs expanding when we move beyond .NET
110 ifExtName :: Maybe FastString }
112 data IfaceClassOp = IfaceClassOp OccName DefMeth IfaceType
113 -- Nothing => no default method
114 -- Just False => ordinary polymorphic default method
115 -- Just True => generic default method
118 = IfAbstractTyCon -- No info
119 | IfOpenDataTyCon -- Open data family
120 | IfOpenNewTyCon -- Open newtype family
121 | IfDataTyCon [IfaceConDecl] -- data type decls
122 | IfNewTyCon IfaceConDecl -- newtype decls
124 visibleIfConDecls :: IfaceConDecls -> [IfaceConDecl]
125 visibleIfConDecls IfAbstractTyCon = []
126 visibleIfConDecls IfOpenDataTyCon = []
127 visibleIfConDecls IfOpenNewTyCon = []
128 visibleIfConDecls (IfDataTyCon cs) = cs
129 visibleIfConDecls (IfNewTyCon c) = [c]
133 ifConOcc :: OccName, -- Constructor name
134 ifConInfix :: Bool, -- True <=> declared infix
135 ifConUnivTvs :: [IfaceTvBndr], -- Universal tyvars
136 ifConExTvs :: [IfaceTvBndr], -- Existential tyvars
137 ifConEqSpec :: [(OccName,IfaceType)], -- Equality contraints
138 ifConCtxt :: IfaceContext, -- Non-stupid context
139 ifConArgTys :: [IfaceType], -- Arg types
140 ifConFields :: [OccName], -- ...ditto... (field labels)
141 ifConStricts :: [StrictnessMark]} -- Empty (meaning all lazy),
142 -- or 1-1 corresp with arg tys
145 = IfaceInst { ifInstCls :: IfaceExtName, -- See comments with
146 ifInstTys :: [Maybe IfaceTyCon], -- the defn of Instance
147 ifDFun :: OccName, -- The dfun
148 ifOFlag :: OverlapFlag, -- Overlap flag
149 ifInstOrph :: Maybe OccName } -- See is_orph in defn of Instance
150 -- There's always a separate IfaceDecl for the DFun, which gives
151 -- its IdInfo with its full type and version number.
152 -- The instance declarations taken together have a version number,
153 -- and we don't want that to wobble gratuitously
154 -- If this instance decl is *used*, we'll record a usage on the dfun;
155 -- and if the head does not change it won't be used if it wasn't before
158 = IfaceFamInst { ifFamInstTyCon :: IfaceTyCon -- Family tycon
159 , ifFamInstTys :: [IfaceType] -- Instance types
162 extractIfFamInsts :: [IfaceDecl] -> [(IfaceFamInst, IfaceDecl)]
163 extractIfFamInsts decls =
164 [(famInst, decl) | decl@IfaceData {ifFamInst = Just famInst} <- decls]
165 -- !!!TODO: we also need a similar case for synonyms
169 ifRuleName :: RuleName,
170 ifActivation :: Activation,
171 ifRuleBndrs :: [IfaceBndr], -- Tyvars and term vars
172 ifRuleHead :: IfaceExtName, -- Head of lhs
173 ifRuleArgs :: [IfaceExpr], -- Args of LHS
174 ifRuleRhs :: IfaceExpr,
175 ifRuleOrph :: Maybe OccName -- Just like IfaceInst
179 = NoInfo -- When writing interface file without -O
180 | HasInfo [IfaceInfoItem] -- Has info, and here it is
182 -- Here's a tricky case:
183 -- * Compile with -O module A, and B which imports A.f
184 -- * Change function f in A, and recompile without -O
185 -- * When we read in old A.hi we read in its IdInfo (as a thunk)
186 -- (In earlier GHCs we used to drop IdInfo immediately on reading,
187 -- but we do not do that now. Instead it's discarded when the
188 -- ModIface is read into the various decl pools.)
189 -- * The version comparsion sees that new (=NoInfo) differs from old (=HasInfo *)
190 -- and so gives a new version.
194 | HsStrictness StrictSig
195 | HsInline Activation
198 | HsWorker IfaceExtName Arity -- Worker, if any see IdInfo.WorkerInfo
199 -- for why we want arity here.
200 -- NB: we need IfaceExtName (not just OccName) because the worker
201 -- can simplify to a function in another module.
202 -- NB: Specialisations and rules come in separately and are
203 -- only later attached to the Id. Partial reason: some are orphans.
205 --------------------------------
207 = IfaceLcl FastString
208 | IfaceExt IfaceExtName
209 | IfaceType IfaceType
210 | IfaceTuple Boxity [IfaceExpr] -- Saturated; type arguments omitted
211 | IfaceLam IfaceBndr IfaceExpr
212 | IfaceApp IfaceExpr IfaceExpr
213 | IfaceCase IfaceExpr FastString IfaceType [IfaceAlt]
214 | IfaceLet IfaceBinding IfaceExpr
215 | IfaceNote IfaceNote IfaceExpr
216 | IfaceCast IfaceExpr IfaceCoercion
218 | IfaceFCall ForeignCall IfaceType
220 data IfaceNote = IfaceSCC CostCentre
222 | IfaceCoreNote String
224 type IfaceAlt = (IfaceConAlt, [FastString], IfaceExpr)
225 -- Note: FastString, not IfaceBndr (and same with the case binder)
226 -- We reconstruct the kind/type of the thing from the context
227 -- thus saving bulk in interface files
229 data IfaceConAlt = IfaceDefault
230 | IfaceDataAlt OccName
231 | IfaceTupleAlt Boxity
232 | IfaceLitAlt Literal
235 = IfaceNonRec IfaceIdBndr IfaceExpr
236 | IfaceRec [(IfaceIdBndr, IfaceExpr)]
240 %************************************************************************
242 \subsection[HsCore-print]{Printing Core unfoldings}
244 %************************************************************************
246 ----------------------------- Printing IfaceDecl ------------------------------------
249 instance Outputable IfaceDecl where
252 pprIfaceDecl (IfaceId {ifName = var, ifType = ty, ifIdInfo = info})
253 = sep [ ppr var <+> dcolon <+> ppr ty,
256 pprIfaceDecl (IfaceForeign {ifName = tycon})
257 = hsep [ptext SLIT("foreign import type dotnet"), ppr tycon]
259 pprIfaceDecl (IfaceSyn {ifName = tycon, ifTyVars = tyvars,
260 ifOpenSyn = False, ifSynRhs = mono_ty})
261 = hang (ptext SLIT("type") <+> pprIfaceDeclHead [] tycon tyvars)
262 4 (equals <+> ppr mono_ty)
264 pprIfaceDecl (IfaceSyn {ifName = tycon, ifTyVars = tyvars,
265 ifOpenSyn = True, ifSynRhs = mono_ty})
266 = hang (ptext SLIT("type family") <+> pprIfaceDeclHead [] tycon tyvars)
267 4 (dcolon <+> ppr mono_ty)
269 pprIfaceDecl (IfaceData {ifName = tycon, ifGeneric = gen, ifCtxt = context,
270 ifTyVars = tyvars, ifCons = condecls,
271 ifRec = isrec, ifFamInst = mbFamInst})
272 = hang (pp_nd <+> pprIfaceDeclHead context tycon tyvars)
273 4 (vcat [pprRec isrec, pprGen gen, pp_condecls tycon condecls,
274 pprFamily mbFamInst])
276 pp_nd = case condecls of
277 IfAbstractTyCon -> ptext SLIT("data")
278 IfOpenDataTyCon -> ptext SLIT("data family")
279 IfDataTyCon _ -> ptext SLIT("data")
280 IfNewTyCon _ -> ptext SLIT("newtype")
281 IfOpenNewTyCon -> ptext SLIT("newtype family")
283 pprIfaceDecl (IfaceClass {ifCtxt = context, ifName = clas, ifTyVars = tyvars,
284 ifFDs = fds, ifATs = ats, ifSigs = sigs,
286 = hang (ptext SLIT("class") <+> pprIfaceDeclHead context clas tyvars <+> pprFundeps fds)
287 4 (vcat [pprRec isrec,
291 pprRec isrec = ptext SLIT("RecFlag") <+> ppr isrec
292 pprGen True = ptext SLIT("Generics: yes")
293 pprGen False = ptext SLIT("Generics: no")
295 pprFamily Nothing = ptext SLIT("FamilyInstance: none")
296 pprFamily (Just famInst) = ptext SLIT("FamilyInstance:") <+> ppr famInst
298 instance Outputable IfaceClassOp where
299 ppr (IfaceClassOp n dm ty) = ppr n <+> ppr dm <+> dcolon <+> ppr ty
301 pprIfaceDeclHead :: IfaceContext -> OccName -> [IfaceTvBndr] -> SDoc
302 pprIfaceDeclHead context thing tyvars
303 = hsep [pprIfaceContext context, parenSymOcc thing (ppr thing),
304 pprIfaceTvBndrs tyvars]
306 pp_condecls tc IfAbstractTyCon = ptext SLIT("{- abstract -}")
307 pp_condecls tc IfOpenNewTyCon = empty
308 pp_condecls tc (IfNewTyCon c) = equals <+> pprIfaceConDecl tc c
309 pp_condecls tc IfOpenDataTyCon = empty
310 pp_condecls tc (IfDataTyCon cs) = equals <+> sep (punctuate (ptext SLIT(" |"))
311 (map (pprIfaceConDecl tc) cs))
314 (IfCon { ifConOcc = name, ifConInfix = is_infix,
315 ifConUnivTvs = univ_tvs, ifConExTvs = ex_tvs,
316 ifConEqSpec = eq_spec, ifConCtxt = ctxt, ifConArgTys = arg_tys,
317 ifConStricts = strs, ifConFields = fields })
319 if is_infix then ptext SLIT("Infix") else empty,
320 if null strs then empty
321 else nest 4 (ptext SLIT("Stricts:") <+> hsep (map ppr strs)),
322 if null fields then empty
323 else nest 4 (ptext SLIT("Fields:") <+> hsep (map ppr fields))]
325 main_payload = ppr name <+> dcolon <+>
326 pprIfaceForAllPart (univ_tvs ++ ex_tvs) (eq_ctxt ++ ctxt) (ppr con_tau)
328 eq_ctxt = [(IfaceEqPred (IfaceTyVar (occNameFS tv)) ty)
329 | (tv,ty) <- eq_spec]
330 con_tau = foldr1 IfaceFunTy (arg_tys ++ [tc_app])
331 tc_app = IfaceTyConApp (IfaceTc (LocalTop tc))
332 [IfaceTyVar tv | (tv,_) <- univ_tvs]
333 -- Gruesome, but jsut for debug print
335 instance Outputable IfaceRule where
336 ppr (IfaceRule { ifRuleName = name, ifActivation = act, ifRuleBndrs = bndrs,
337 ifRuleHead = fn, ifRuleArgs = args, ifRuleRhs = rhs })
338 = sep [hsep [doubleQuotes (ftext name), ppr act,
339 ptext SLIT("forall") <+> pprIfaceBndrs bndrs],
340 nest 2 (sep [ppr fn <+> sep (map (pprIfaceExpr parens) args),
341 ptext SLIT("=") <+> ppr rhs])
344 instance Outputable IfaceInst where
345 ppr (IfaceInst {ifDFun = dfun_id, ifOFlag = flag,
346 ifInstCls = cls, ifInstTys = mb_tcs})
347 = hang (ptext SLIT("instance") <+> ppr flag
348 <+> ppr cls <+> brackets (pprWithCommas ppr_mb mb_tcs))
349 2 (equals <+> ppr dfun_id)
352 ppr_mb (Just tc) = ppr tc
354 instance Outputable IfaceFamInst where
355 ppr (IfaceFamInst {ifFamInstTyCon = tycon, ifFamInstTys = tys})
356 = ppr tycon <+> hsep (map ppr tys)
360 ----------------------------- Printing IfaceExpr ------------------------------------
363 instance Outputable IfaceExpr where
364 ppr e = pprIfaceExpr noParens e
366 pprIfaceExpr :: (SDoc -> SDoc) -> IfaceExpr -> SDoc
367 -- The function adds parens in context that need
368 -- an atomic value (e.g. function args)
370 pprIfaceExpr add_par (IfaceLcl v) = ppr v
371 pprIfaceExpr add_par (IfaceExt v) = ppr v
372 pprIfaceExpr add_par (IfaceLit l) = ppr l
373 pprIfaceExpr add_par (IfaceFCall cc ty) = braces (ppr cc <+> ppr ty)
374 pprIfaceExpr add_par (IfaceType ty) = char '@' <+> pprParendIfaceType ty
376 pprIfaceExpr add_par app@(IfaceApp _ _) = add_par (pprIfaceApp app [])
377 pprIfaceExpr add_par (IfaceTuple c as) = tupleParens c (interpp'SP as)
379 pprIfaceExpr add_par e@(IfaceLam _ _)
380 = add_par (sep [char '\\' <+> sep (map ppr bndrs) <+> arrow,
381 pprIfaceExpr noParens body])
383 (bndrs,body) = collect [] e
384 collect bs (IfaceLam b e) = collect (b:bs) e
385 collect bs e = (reverse bs, e)
388 pprIfaceExpr add_par (IfaceCase scrut bndr ty [(con, bs, rhs)])
390 = add_par (sep [ptext SLIT("case") <+> char '@' <+> pprParendIfaceType ty <+> pprIfaceExpr noParens scrut <+> ptext SLIT("of")
391 <+> ppr bndr <+> char '{' <+> ppr_con_bs con bs <+> arrow,
392 pprIfaceExpr noParens rhs <+> char '}'])
395 pprIfaceExpr add_par (IfaceCase scrut bndr ty alts)
397 = add_par (sep [ptext SLIT("case") <+> char '@' <+> pprParendIfaceType ty <+> pprIfaceExpr noParens scrut <+> ptext SLIT("of")
398 <+> ppr bndr <+> char '{',
399 nest 2 (sep (map ppr_alt alts)) <+> char '}'])
401 pprIfaceExpr add_par (IfaceCast expr co) = add_par (ptext SLIT("cast") <+> ppr expr <+> ppr co)
403 pprIfaceExpr add_par (IfaceLet (IfaceNonRec b rhs) body)
404 = add_par (sep [ptext SLIT("let {"),
405 nest 2 (ppr_bind (b, rhs)),
407 pprIfaceExpr noParens body])
409 pprIfaceExpr add_par (IfaceLet (IfaceRec pairs) body)
410 = add_par (sep [ptext SLIT("letrec {"),
411 nest 2 (sep (map ppr_bind pairs)),
413 pprIfaceExpr noParens body])
415 pprIfaceExpr add_par (IfaceNote note body) = add_par (ppr note <+> pprIfaceExpr parens body)
417 ppr_alt (con, bs, rhs) = sep [ppr_con_bs con bs,
418 arrow <+> pprIfaceExpr noParens rhs]
420 ppr_con_bs (IfaceTupleAlt tup_con) bs = tupleParens tup_con (interpp'SP bs)
421 ppr_con_bs con bs = ppr con <+> hsep (map ppr bs)
423 ppr_bind ((b,ty),rhs) = sep [ppr b <+> dcolon <+> ppr ty,
424 equals <+> pprIfaceExpr noParens rhs]
427 pprIfaceApp (IfaceApp fun arg) args = pprIfaceApp fun (nest 2 (pprIfaceExpr parens arg) : args)
428 pprIfaceApp fun args = sep (pprIfaceExpr parens fun : args)
431 instance Outputable IfaceNote where
432 ppr (IfaceSCC cc) = pprCostCentreCore cc
433 ppr IfaceInlineMe = ptext SLIT("__inline_me")
434 ppr (IfaceCoreNote s) = ptext SLIT("__core_note") <+> pprHsString (mkFastString s)
436 instance Outputable IfaceConAlt where
437 ppr IfaceDefault = text "DEFAULT"
438 ppr (IfaceLitAlt l) = ppr l
439 ppr (IfaceDataAlt d) = ppr d
440 ppr (IfaceTupleAlt b) = panic "ppr IfaceConAlt"
441 -- IfaceTupleAlt is handled by the case-alternative printer
444 instance Outputable IfaceIdInfo where
446 ppr (HasInfo is) = ptext SLIT("{-") <+> fsep (map ppr_hs_info is) <+> ptext SLIT("-}")
448 ppr_hs_info (HsUnfold unf) = ptext SLIT("Unfolding:") <+>
449 parens (pprIfaceExpr noParens unf)
450 ppr_hs_info (HsInline act) = ptext SLIT("Inline:") <+> ppr act
451 ppr_hs_info (HsArity arity) = ptext SLIT("Arity:") <+> int arity
452 ppr_hs_info (HsStrictness str) = ptext SLIT("Strictness:") <+> pprIfaceStrictSig str
453 ppr_hs_info HsNoCafRefs = ptext SLIT("HasNoCafRefs")
454 ppr_hs_info (HsWorker w a) = ptext SLIT("Worker:") <+> ppr w <+> int a
458 %************************************************************************
460 Equality, for interface file version generaion only
462 %************************************************************************
464 Equality over IfaceSyn returns an IfaceEq, not a Bool. The new constructor is
465 EqBut, which gives the set of *locally-defined* things whose version must be equal
466 for the whole thing to be equal. So the key function is eqIfExt, which compares
469 Of course, equality is also done modulo alpha conversion.
473 = Equal -- Definitely exactly the same
474 | NotEqual -- Definitely different
475 | EqBut OccSet -- The same provided these local things have not changed
477 instance Outputable IfaceEq where
478 ppr Equal = ptext SLIT("Equal")
479 ppr NotEqual = ptext SLIT("NotEqual")
480 ppr (EqBut occset) = ptext SLIT("EqBut") <+> ppr (occSetElts occset)
482 bool :: Bool -> IfaceEq
484 bool False = NotEqual
486 toBool :: IfaceEq -> Bool
488 toBool (EqBut _) = True
489 toBool NotEqual = False
491 zapEq :: IfaceEq -> IfaceEq -- Used to forget EqBut information
492 zapEq (EqBut _) = Equal
495 (&&&) :: IfaceEq -> IfaceEq -> IfaceEq
497 NotEqual &&& x = NotEqual
498 EqBut occs &&& Equal = EqBut occs
499 EqBut occs &&& NotEqual = NotEqual
500 EqBut occs1 &&& EqBut occs2 = EqBut (occs1 `unionOccSets` occs2)
502 ---------------------
503 eqIfExt :: IfaceExtName -> IfaceExtName -> IfaceEq
504 -- This function is the core of the EqBut stuff
505 eqIfExt (ExtPkg mod1 occ1) (ExtPkg mod2 occ2) = bool (mod1==mod2 && occ1==occ2)
506 eqIfExt (HomePkg mod1 occ1 v1) (HomePkg mod2 occ2 v2) = bool (mod1==mod2 && occ1==occ2 && v1==v2)
507 eqIfExt (LocalTop occ1) (LocalTop occ2) | occ1 == occ2 = EqBut (unitOccSet occ1)
508 eqIfExt (LocalTopSub occ1 p1) (LocalTop occ2) | occ1 == occ2 = EqBut (unitOccSet p1)
509 eqIfExt (LocalTopSub occ1 p1) (LocalTopSub occ2 _) | occ1 == occ2 = EqBut (unitOccSet p1)
510 eqIfExt n1 n2 = NotEqual
515 ---------------------
516 checkBootDecl :: IfaceDecl -- The boot decl
517 -> IfaceDecl -- The real decl
518 -> Bool -- True <=> compatible
519 checkBootDecl (IfaceId s1 t1 _) (IfaceId s2 t2 _)
520 = ASSERT( s1==s2 ) toBool (t1 `eqIfType` t2)
522 checkBootDecl d1@(IfaceForeign {}) d2@(IfaceForeign {})
523 = ASSERT (ifName d1 == ifName d2 ) ifExtName d1 == ifExtName d2
525 checkBootDecl d1@(IfaceSyn {}) d2@(IfaceSyn {})
526 = ASSERT( ifName d1 == ifName d2 )
527 toBool $ eqWith (ifTyVars d1) (ifTyVars d2) $ \ env ->
528 eq_ifType env (ifSynRhs d1) (ifSynRhs d2)
530 checkBootDecl d1@(IfaceData {}) d2@(IfaceData {})
531 -- We don't check the recursion flags because the boot-one is
532 -- recursive, to be conservative, but the real one may not be.
533 -- I'm not happy with the way recursive flags are dealt with.
534 = ASSERT( ifName d1 == ifName d2 )
535 toBool $ eqWith (ifTyVars d1) (ifTyVars d2) $ \ env ->
536 eq_ifContext env (ifCtxt d1) (ifCtxt d2) &&&
538 IfAbstractTyCon -> Equal
539 cons1 -> eq_hsCD env cons1 (ifCons d2)
541 checkBootDecl d1@(IfaceClass {}) d2@(IfaceClass {})
542 = ASSERT( ifName d1 == ifName d2 )
543 toBool $ eqWith (ifTyVars d1) (ifTyVars d2) $ \ env ->
544 eqListBy (eq_hsFD env) (ifFDs d1) (ifFDs d2) &&&
545 case (ifCtxt d1, ifSigs d1) of
547 (cxt1, sigs1) -> eq_ifContext env cxt1 (ifCtxt d2) &&&
548 eqListBy (eq_cls_sig env) sigs1 (ifSigs d2)
550 checkBootDecl _ _ = False -- default case
552 ---------------------
553 eqIfDecl :: IfaceDecl -> IfaceDecl -> IfaceEq
554 eqIfDecl (IfaceId s1 t1 i1) (IfaceId s2 t2 i2)
555 = bool (s1 == s2) &&& (t1 `eqIfType` t2) &&& (i1 `eqIfIdInfo` i2)
557 eqIfDecl d1@(IfaceForeign {}) d2@(IfaceForeign {})
558 = bool (ifName d1 == ifName d2 && ifExtName d1 == ifExtName d2)
560 eqIfDecl d1@(IfaceData {}) d2@(IfaceData {})
561 = bool (ifName d1 == ifName d2 &&
562 ifRec d1 == ifRec d2 &&
563 ifGadtSyntax d1 == ifGadtSyntax d2 &&
564 ifGeneric d1 == ifGeneric d2) &&&
565 ifFamInst d1 `eqIfTc_fam` ifFamInst d2 &&&
566 eqWith (ifTyVars d1) (ifTyVars d2) (\ env ->
567 eq_ifContext env (ifCtxt d1) (ifCtxt d2) &&&
568 eq_hsCD env (ifCons d1) (ifCons d2)
570 -- The type variables of the data type do not scope
571 -- over the constructors (any more), but they do scope
572 -- over the stupid context in the IfaceConDecls
574 Nothing `eqIfTc_fam` Nothing = Equal
575 (Just (IfaceFamInst fam1 tys1))
576 `eqIfTc_fam` (Just (IfaceFamInst fam2 tys2)) =
577 fam1 `eqIfTc` fam2 &&& eqListBy eqIfType tys1 tys2
578 _ `eqIfTc_fam` _ = NotEqual
580 eqIfDecl d1@(IfaceSyn {}) d2@(IfaceSyn {})
581 = bool (ifName d1 == ifName d2) &&&
582 eqWith (ifTyVars d1) (ifTyVars d2) (\ env ->
583 eq_ifType env (ifSynRhs d1) (ifSynRhs d2)
586 eqIfDecl d1@(IfaceClass {}) d2@(IfaceClass {})
587 = bool (ifName d1 == ifName d2 &&
588 ifRec d1 == ifRec d2) &&&
589 eqWith (ifTyVars d1) (ifTyVars d2) (\ env ->
590 eq_ifContext env (ifCtxt d1) (ifCtxt d2) &&&
591 eqListBy (eq_hsFD env) (ifFDs d1) (ifFDs d2) &&&
592 eqListBy eqIfDecl (ifATs d1) (ifATs d2) &&&
593 eqListBy (eq_cls_sig env) (ifSigs d1) (ifSigs d2)
596 eqIfDecl _ _ = NotEqual -- default case
599 eqWith :: [IfaceTvBndr] -> [IfaceTvBndr] -> (EqEnv -> IfaceEq) -> IfaceEq
600 eqWith = eq_ifTvBndrs emptyEqEnv
602 -----------------------
603 eqIfInst d1 d2 = bool (ifDFun d1 == ifDFun d2 && ifOFlag d1 == ifOFlag d2)
604 -- All other changes are handled via the version info on the dfun
606 eqIfRule (IfaceRule n1 a1 bs1 f1 es1 rhs1 o1)
607 (IfaceRule n2 a2 bs2 f2 es2 rhs2 o2)
608 = bool (n1==n2 && a1==a2 && o1 == o2) &&&
610 eq_ifBndrs emptyEqEnv bs1 bs2 (\env ->
611 zapEq (eqListBy (eq_ifaceExpr env) es1 es2) &&&
612 -- zapEq: for the LHSs, ignore the EqBut part
613 eq_ifaceExpr env rhs1 rhs2)
615 eq_hsCD env (IfDataTyCon c1) (IfDataTyCon c2)
616 = eqListBy (eq_ConDecl env) c1 c2
618 eq_hsCD env (IfNewTyCon c1) (IfNewTyCon c2) = eq_ConDecl env c1 c2
619 eq_hsCD env IfAbstractTyCon IfAbstractTyCon = Equal
620 eq_hsCD env IfOpenDataTyCon IfOpenDataTyCon = Equal
621 eq_hsCD env IfOpenNewTyCon IfOpenNewTyCon = Equal
622 eq_hsCD env d1 d2 = NotEqual
625 = bool (ifConOcc c1 == ifConOcc c2 &&
626 ifConInfix c1 == ifConInfix c2 &&
627 ifConStricts c1 == ifConStricts c2 &&
628 ifConFields c1 == ifConFields c2) &&&
629 eq_ifTvBndrs env (ifConUnivTvs c1) (ifConUnivTvs c2) (\ env ->
630 eq_ifTvBndrs env (ifConExTvs c1) (ifConExTvs c2) (\ env ->
631 eq_ifContext env (ifConCtxt c1) (ifConCtxt c2) &&&
632 eq_ifTypes env (ifConArgTys c1) (ifConArgTys c2)))
634 eq_hsFD env (ns1,ms1) (ns2,ms2)
635 = eqListBy (eqIfOcc env) ns1 ns2 &&& eqListBy (eqIfOcc env) ms1 ms2
637 eq_cls_sig env (IfaceClassOp n1 dm1 ty1) (IfaceClassOp n2 dm2 ty2)
638 = bool (n1==n2 && dm1 == dm2) &&& eq_ifType env ty1 ty2
644 eqIfIdInfo NoInfo NoInfo = Equal
645 eqIfIdInfo (HasInfo is1) (HasInfo is2) = eqListBy eq_item is1 is2
646 eqIfIdInfo i1 i2 = NotEqual
648 eq_item (HsInline a1) (HsInline a2) = bool (a1 == a2)
649 eq_item (HsArity a1) (HsArity a2) = bool (a1 == a2)
650 eq_item (HsStrictness s1) (HsStrictness s2) = bool (s1 == s2)
651 eq_item (HsUnfold u1) (HsUnfold u2) = eq_ifaceExpr emptyEqEnv u1 u2
652 eq_item HsNoCafRefs HsNoCafRefs = Equal
653 eq_item (HsWorker wkr1 a1) (HsWorker wkr2 a2) = bool (a1==a2) &&& (wkr1 `eqIfExt` wkr2)
654 eq_item _ _ = NotEqual
657 eq_ifaceExpr :: EqEnv -> IfaceExpr -> IfaceExpr -> IfaceEq
658 eq_ifaceExpr env (IfaceLcl v1) (IfaceLcl v2) = eqIfOcc env v1 v2
659 eq_ifaceExpr env (IfaceExt v1) (IfaceExt v2) = eqIfExt v1 v2
660 eq_ifaceExpr env (IfaceLit l1) (IfaceLit l2) = bool (l1 == l2)
661 eq_ifaceExpr env (IfaceFCall c1 ty1) (IfaceFCall c2 ty2) = bool (c1==c2) &&& eq_ifType env ty1 ty2
662 eq_ifaceExpr env (IfaceType ty1) (IfaceType ty2) = eq_ifType env ty1 ty2
663 eq_ifaceExpr env (IfaceTuple n1 as1) (IfaceTuple n2 as2) = bool (n1==n2) &&& eqListBy (eq_ifaceExpr env) as1 as2
664 eq_ifaceExpr env (IfaceLam b1 body1) (IfaceLam b2 body2) = eq_ifBndr env b1 b2 (\env -> eq_ifaceExpr env body1 body2)
665 eq_ifaceExpr env (IfaceApp f1 a1) (IfaceApp f2 a2) = eq_ifaceExpr env f1 f2 &&& eq_ifaceExpr env a1 a2
666 eq_ifaceExpr env (IfaceCast e1 co1) (IfaceCast e2 co2) = eq_ifaceExpr env e1 e2 &&& eq_ifType env co1 co2
667 eq_ifaceExpr env (IfaceNote n1 r1) (IfaceNote n2 r2) = eq_ifaceNote env n1 n2 &&& eq_ifaceExpr env r1 r2
669 eq_ifaceExpr env (IfaceCase s1 b1 ty1 as1) (IfaceCase s2 b2 ty2 as2)
670 = eq_ifaceExpr env s1 s2 &&&
671 eq_ifType env ty1 ty2 &&&
672 eq_ifNakedBndr env b1 b2 (\env -> eqListBy (eq_ifaceAlt env) as1 as2)
674 eq_ifaceAlt env (c1,bs1,r1) (c2,bs2,r2)
675 = bool (eq_ifaceConAlt c1 c2) &&&
676 eq_ifNakedBndrs env bs1 bs2 (\env -> eq_ifaceExpr env r1 r2)
678 eq_ifaceExpr env (IfaceLet (IfaceNonRec b1 r1) x1) (IfaceLet (IfaceNonRec b2 r2) x2)
679 = eq_ifaceExpr env r1 r2 &&& eq_ifIdBndr env b1 b2 (\env -> eq_ifaceExpr env x1 x2)
681 eq_ifaceExpr env (IfaceLet (IfaceRec as1) x1) (IfaceLet (IfaceRec as2) x2)
682 = eq_ifIdBndrs env bs1 bs2 (\env -> eqListBy (eq_ifaceExpr env) rs1 rs2 &&& eq_ifaceExpr env x1 x2)
684 (bs1,rs1) = unzip as1
685 (bs2,rs2) = unzip as2
688 eq_ifaceExpr env _ _ = NotEqual
691 eq_ifaceConAlt :: IfaceConAlt -> IfaceConAlt -> Bool
692 eq_ifaceConAlt IfaceDefault IfaceDefault = True
693 eq_ifaceConAlt (IfaceDataAlt n1) (IfaceDataAlt n2) = n1==n2
694 eq_ifaceConAlt (IfaceTupleAlt c1) (IfaceTupleAlt c2) = c1==c2
695 eq_ifaceConAlt (IfaceLitAlt l1) (IfaceLitAlt l2) = l1==l2
696 eq_ifaceConAlt _ _ = False
699 eq_ifaceNote :: EqEnv -> IfaceNote -> IfaceNote -> IfaceEq
700 eq_ifaceNote env (IfaceSCC c1) (IfaceSCC c2) = bool (c1==c2)
701 eq_ifaceNote env IfaceInlineMe IfaceInlineMe = Equal
702 eq_ifaceNote env (IfaceCoreNote s1) (IfaceCoreNote s2) = bool (s1==s2)
703 eq_ifaceNote env _ _ = NotEqual
707 ---------------------
708 eqIfType t1 t2 = eq_ifType emptyEqEnv t1 t2
711 eq_ifType env (IfaceTyVar n1) (IfaceTyVar n2) = eqIfOcc env n1 n2
712 eq_ifType env (IfaceAppTy s1 t1) (IfaceAppTy s2 t2) = eq_ifType env s1 s2 &&& eq_ifType env t1 t2
713 eq_ifType env (IfacePredTy st1) (IfacePredTy st2) = eq_ifPredType env st1 st2
714 eq_ifType env (IfaceTyConApp tc1 ts1) (IfaceTyConApp tc2 ts2) = tc1 `eqIfTc` tc2 &&& eq_ifTypes env ts1 ts2
715 eq_ifType env (IfaceForAllTy tv1 t1) (IfaceForAllTy tv2 t2) = eq_ifTvBndr env tv1 tv2 (\env -> eq_ifType env t1 t2)
716 eq_ifType env (IfaceFunTy s1 t1) (IfaceFunTy s2 t2) = eq_ifType env s1 s2 &&& eq_ifType env t1 t2
717 eq_ifType env _ _ = NotEqual
720 eq_ifTypes env = eqListBy (eq_ifType env)
723 eq_ifContext env a b = eqListBy (eq_ifPredType env) a b
726 eq_ifPredType env (IfaceClassP c1 tys1) (IfaceClassP c2 tys2) = c1 `eqIfExt` c2 &&& eq_ifTypes env tys1 tys2
727 eq_ifPredType env (IfaceIParam n1 ty1) (IfaceIParam n2 ty2) = bool (n1 == n2) &&& eq_ifType env ty1 ty2
728 eq_ifPredType env _ _ = NotEqual
731 eqIfTc (IfaceTc tc1) (IfaceTc tc2) = tc1 `eqIfExt` tc2
732 eqIfTc IfaceIntTc IfaceIntTc = Equal
733 eqIfTc IfaceCharTc IfaceCharTc = Equal
734 eqIfTc IfaceBoolTc IfaceBoolTc = Equal
735 eqIfTc IfaceListTc IfaceListTc = Equal
736 eqIfTc IfacePArrTc IfacePArrTc = Equal
737 eqIfTc (IfaceTupTc bx1 ar1) (IfaceTupTc bx2 ar2) = bool (bx1==bx2 && ar1==ar2)
738 eqIfTc IfaceLiftedTypeKindTc IfaceLiftedTypeKindTc = Equal
739 eqIfTc IfaceOpenTypeKindTc IfaceOpenTypeKindTc = Equal
740 eqIfTc IfaceUnliftedTypeKindTc IfaceUnliftedTypeKindTc = Equal
741 eqIfTc IfaceUbxTupleKindTc IfaceUbxTupleKindTc = Equal
742 eqIfTc IfaceArgTypeKindTc IfaceArgTypeKindTc = Equal
743 eqIfTc _ _ = NotEqual
746 -----------------------------------------------------------
747 Support code for equality checking
748 -----------------------------------------------------------
751 ------------------------------------
752 type EqEnv = UniqFM FastString -- Tracks the mapping from L-variables to R-variables
754 eqIfOcc :: EqEnv -> FastString -> FastString -> IfaceEq
755 eqIfOcc env n1 n2 = case lookupUFM env n1 of
756 Just n1 -> bool (n1 == n2)
757 Nothing -> bool (show n1 == show n2)
759 extendEqEnv :: EqEnv -> FastString -> FastString -> EqEnv
760 extendEqEnv env n1 n2 | n1 == n2 = env
761 | otherwise = addToUFM env n1 n2
764 emptyEqEnv = emptyUFM
766 ------------------------------------
767 type ExtEnv bndr = EqEnv -> bndr -> bndr -> (EqEnv -> IfaceEq) -> IfaceEq
769 eq_ifNakedBndr :: ExtEnv FastString
770 eq_ifBndr :: ExtEnv IfaceBndr
771 eq_ifTvBndr :: ExtEnv IfaceTvBndr
772 eq_ifIdBndr :: ExtEnv IfaceIdBndr
774 eq_ifNakedBndr env n1 n2 k = k (extendEqEnv env n1 n2)
776 eq_ifBndr env (IfaceIdBndr b1) (IfaceIdBndr b2) k = eq_ifIdBndr env b1 b2 k
777 eq_ifBndr env (IfaceTvBndr b1) (IfaceTvBndr b2) k = eq_ifTvBndr env b1 b2 k
778 eq_ifBndr _ _ _ _ = NotEqual
780 eq_ifTvBndr env (v1, k1) (v2, k2) k = eq_ifType env k1 k2 &&& k (extendEqEnv env v1 v2)
781 eq_ifIdBndr env (v1, t1) (v2, t2) k = eq_ifType env t1 t2 &&& k (extendEqEnv env v1 v2)
783 eq_ifBndrs :: ExtEnv [IfaceBndr]
784 eq_ifIdBndrs :: ExtEnv [IfaceIdBndr]
785 eq_ifTvBndrs :: ExtEnv [IfaceTvBndr]
786 eq_ifNakedBndrs :: ExtEnv [FastString]
787 eq_ifBndrs = eq_bndrs_with eq_ifBndr
788 eq_ifIdBndrs = eq_bndrs_with eq_ifIdBndr
789 eq_ifTvBndrs = eq_bndrs_with eq_ifTvBndr
790 eq_ifNakedBndrs = eq_bndrs_with eq_ifNakedBndr
792 eq_bndrs_with eq env [] [] k = k env
793 eq_bndrs_with eq env (b1:bs1) (b2:bs2) k = eq env b1 b2 (\env -> eq_bndrs_with eq env bs1 bs2 k)
794 eq_bndrs_with eq env _ _ _ = NotEqual
798 eqListBy :: (a->a->IfaceEq) -> [a] -> [a] -> IfaceEq
799 eqListBy eq [] [] = Equal
800 eqListBy eq (x:xs) (y:ys) = eq x y &&& eqListBy eq xs ys
801 eqListBy eq xs ys = NotEqual
803 eqMaybeBy :: (a->a->IfaceEq) -> Maybe a -> Maybe a -> IfaceEq
804 eqMaybeBy eq Nothing Nothing = Equal
805 eqMaybeBy eq (Just x) (Just y) = eq x y
806 eqMaybeBy eq x y = NotEqual