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 TyCon ( ArgVrcs )
42 import OccName ( OccName, parenSymOcc, occNameFS,
43 OccSet, unionOccSets, unitOccSet )
44 import UniqFM ( UniqFM, emptyUFM, addToUFM, lookupUFM )
45 import Name ( Name, NamedThing(..), nameOccName, isExternalName )
46 import CostCentre ( CostCentre, pprCostCentreCore )
47 import Literal ( Literal )
48 import ForeignCall ( ForeignCall )
49 import BasicTypes ( Arity, Activation(..), StrictnessMark, OverlapFlag,
50 RecFlag(..), Boxity(..),
51 isAlwaysActive, tupleParens )
54 import Maybes ( catMaybes )
55 import Util ( lengthIs )
58 infix 4 `eqIfExt`, `eqIfIdInfo`, `eqIfType`
62 %************************************************************************
64 Data type declarations
66 %************************************************************************
70 = IfaceId { ifName :: OccName,
72 ifIdInfo :: IfaceIdInfo }
74 | IfaceData { ifName :: OccName, -- Type constructor
75 ifTyVars :: [IfaceTvBndr], -- Type variables
76 ifCtxt :: IfaceContext, -- The "stupid theta"
77 ifCons :: IfaceConDecls, -- Includes new/data info
78 ifRec :: RecFlag, -- Recursive or not?
80 ifGadtSyntax :: Bool, -- True <=> declared using GADT syntax
81 ifGeneric :: Bool -- True <=> generic converter functions available
82 } -- We need this for imported data decls, since the
83 -- imported modules may have been compiled with
84 -- different flags to the current compilation unit
86 | IfaceSyn { ifName :: OccName, -- Type constructor
87 ifTyVars :: [IfaceTvBndr], -- Type variables
89 ifSynRhs :: IfaceType -- synonym expansion
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?
98 ifVrcs :: ArgVrcs -- ... and what are its argument variances ...
101 | IfaceForeign { ifName :: OccName, -- Needs expanding when we move beyond .NET
102 ifExtName :: Maybe FastString }
104 data IfaceClassOp = IfaceClassOp OccName DefMeth IfaceType
105 -- Nothing => no default method
106 -- Just False => ordinary polymorphic default method
107 -- Just True => generic default method
110 = IfAbstractTyCon -- No info
111 | IfDataTyCon [IfaceConDecl] -- data type decls
112 | IfNewTyCon IfaceConDecl -- newtype decls
114 visibleIfConDecls :: IfaceConDecls -> [IfaceConDecl]
115 visibleIfConDecls IfAbstractTyCon = []
116 visibleIfConDecls (IfDataTyCon cs) = cs
117 visibleIfConDecls (IfNewTyCon c) = [c]
121 ifConOcc :: OccName, -- Constructor name
122 ifConInfix :: Bool, -- True <=> declared infix
123 ifConUnivTvs :: [IfaceTvBndr], -- Universal tyvars
124 ifConExTvs :: [IfaceTvBndr], -- Existential tyvars
125 ifConEqSpec :: [(OccName,IfaceType)], -- Equality contraints
126 ifConCtxt :: IfaceContext, -- Non-stupid context
127 ifConArgTys :: [IfaceType], -- Arg types
128 ifConFields :: [OccName], -- ...ditto... (field labels)
129 ifConStricts :: [StrictnessMark] } -- Empty (meaning all lazy), or 1-1 corresp with arg types
132 = IfaceInst { ifInstCls :: IfaceExtName, -- See comments with
133 ifInstTys :: [Maybe IfaceTyCon], -- the defn of Instance
134 ifDFun :: OccName, -- The dfun
135 ifOFlag :: OverlapFlag, -- Overlap flag
136 ifInstOrph :: Maybe OccName } -- See is_orph in defn of Instance
137 -- There's always a separate IfaceDecl for the DFun, which gives
138 -- its IdInfo with its full type and version number.
139 -- The instance declarations taken together have a version number,
140 -- and we don't want that to wobble gratuitously
141 -- If this instance decl is *used*, we'll record a usage on the dfun;
142 -- and if the head does not change it won't be used if it wasn't before
146 ifRuleName :: RuleName,
147 ifActivation :: Activation,
148 ifRuleBndrs :: [IfaceBndr], -- Tyvars and term vars
149 ifRuleHead :: IfaceExtName, -- Head of lhs
150 ifRuleArgs :: [IfaceExpr], -- Args of LHS
151 ifRuleRhs :: IfaceExpr,
152 ifRuleOrph :: Maybe OccName -- Just like IfaceInst
156 = NoInfo -- When writing interface file without -O
157 | HasInfo [IfaceInfoItem] -- Has info, and here it is
159 -- Here's a tricky case:
160 -- * Compile with -O module A, and B which imports A.f
161 -- * Change function f in A, and recompile without -O
162 -- * When we read in old A.hi we read in its IdInfo (as a thunk)
163 -- (In earlier GHCs we used to drop IdInfo immediately on reading,
164 -- but we do not do that now. Instead it's discarded when the
165 -- ModIface is read into the various decl pools.)
166 -- * The version comparsion sees that new (=NoInfo) differs from old (=HasInfo *)
167 -- and so gives a new version.
171 | HsStrictness StrictSig
172 | HsInline Activation
175 | HsWorker IfaceExtName Arity -- Worker, if any see IdInfo.WorkerInfo
176 -- for why we want arity here.
177 -- NB: we need IfaceExtName (not just OccName) because the worker
178 -- can simplify to a function in another module.
179 -- NB: Specialisations and rules come in separately and are
180 -- only later attached to the Id. Partial reason: some are orphans.
182 --------------------------------
184 = IfaceLcl FastString
185 | IfaceExt IfaceExtName
186 | IfaceType IfaceType
187 | IfaceTuple Boxity [IfaceExpr] -- Saturated; type arguments omitted
188 | IfaceLam IfaceBndr IfaceExpr
189 | IfaceApp IfaceExpr IfaceExpr
190 | IfaceCase IfaceExpr FastString IfaceType [IfaceAlt]
191 | IfaceLet IfaceBinding IfaceExpr
192 | IfaceNote IfaceNote IfaceExpr
193 | IfaceCast IfaceExpr IfaceCoercion
195 | IfaceFCall ForeignCall IfaceType
197 data IfaceNote = IfaceSCC CostCentre
199 | IfaceCoreNote String
201 type IfaceAlt = (IfaceConAlt, [FastString], IfaceExpr)
202 -- Note: OccName, not IfaceBndr (and same with the case binder)
203 -- We reconstruct the kind/type of the thing from the context
204 -- thus saving bulk in interface files
206 data IfaceConAlt = IfaceDefault
207 | IfaceDataAlt OccName
208 | IfaceTupleAlt Boxity
209 | IfaceLitAlt Literal
212 = IfaceNonRec IfaceIdBndr IfaceExpr
213 | IfaceRec [(IfaceIdBndr, IfaceExpr)]
217 %************************************************************************
219 \subsection[HsCore-print]{Printing Core unfoldings}
221 %************************************************************************
223 ----------------------------- Printing IfaceDecl ------------------------------------
226 instance Outputable IfaceDecl where
229 pprIfaceDecl (IfaceId {ifName = var, ifType = ty, ifIdInfo = info})
230 = sep [ ppr var <+> dcolon <+> ppr ty,
233 pprIfaceDecl (IfaceForeign {ifName = tycon})
234 = hsep [ptext SLIT("foreign import type dotnet"), ppr tycon]
236 pprIfaceDecl (IfaceSyn {ifName = tycon, ifTyVars = tyvars, ifSynRhs = mono_ty, ifVrcs = vrcs})
237 = hang (ptext SLIT("type") <+> pprIfaceDeclHead [] tycon tyvars)
238 4 (vcat [equals <+> ppr mono_ty,
241 pprIfaceDecl (IfaceData {ifName = tycon, ifGeneric = gen, ifCtxt = context,
242 ifTyVars = tyvars, ifCons = condecls,
243 ifRec = isrec, ifVrcs = vrcs})
244 = hang (pp_nd <+> pprIfaceDeclHead context tycon tyvars)
245 4 (vcat [pprVrcs vrcs, pprRec isrec, pprGen gen, pp_condecls tycon condecls])
247 pp_nd = case condecls of
248 IfAbstractTyCon -> ptext SLIT("data")
249 IfDataTyCon _ -> ptext SLIT("data")
250 IfNewTyCon _ -> ptext SLIT("newtype")
252 pprIfaceDecl (IfaceClass {ifCtxt = context, ifName = clas, ifTyVars = tyvars,
253 ifFDs = fds, ifSigs = sigs, ifVrcs = vrcs, ifRec = isrec})
254 = hang (ptext SLIT("class") <+> pprIfaceDeclHead context clas tyvars <+> pprFundeps fds)
255 4 (vcat [pprVrcs vrcs,
259 pprVrcs vrcs = ptext SLIT("Variances") <+> ppr vrcs
260 pprRec isrec = ptext SLIT("RecFlag") <+> ppr isrec
261 pprGen True = ptext SLIT("Generics: yes")
262 pprGen False = ptext SLIT("Generics: no")
264 instance Outputable IfaceClassOp where
265 ppr (IfaceClassOp n dm ty) = ppr n <+> ppr dm <+> dcolon <+> ppr ty
267 pprIfaceDeclHead :: IfaceContext -> OccName -> [IfaceTvBndr] -> SDoc
268 pprIfaceDeclHead context thing tyvars
269 = hsep [pprIfaceContext context, parenSymOcc thing (ppr thing), pprIfaceTvBndrs tyvars]
271 pp_condecls tc IfAbstractTyCon = ptext SLIT("{- abstract -}")
272 pp_condecls tc (IfNewTyCon c) = equals <+> pprIfaceConDecl tc c
273 pp_condecls tc (IfDataTyCon cs) = equals <+> sep (punctuate (ptext SLIT(" |"))
274 (map (pprIfaceConDecl tc) cs))
277 (IfCon { ifConOcc = name, ifConInfix = is_infix,
278 ifConUnivTvs = univ_tvs, ifConExTvs = ex_tvs,
279 ifConEqSpec = eq_spec, ifConCtxt = ctxt, ifConArgTys = arg_tys,
280 ifConStricts = strs, ifConFields = fields })
282 if is_infix then ptext SLIT("Infix") else empty,
283 if null strs then empty
284 else nest 4 (ptext SLIT("Stricts:") <+> hsep (map ppr strs)),
285 if null fields then empty
286 else nest 4 (ptext SLIT("Fields:") <+> hsep (map ppr fields))]
288 main_payload = ppr name <+> dcolon <+>
289 pprIfaceForAllPart (univ_tvs ++ ex_tvs) (eq_ctxt ++ ctxt) (ppr con_tau)
291 eq_ctxt = [(IfaceEqPred (IfaceTyVar tv) ty) | (tv,ty) <- eq_spec]
292 con_tau = foldr1 IfaceFunTy (arg_tys ++ [tc_app])
293 tc_app = IfaceTyConApp (IfaceTc (LocalTop tc))
294 [IfaceTyVar tv | (tv,_) <- univ_tvs]
295 -- Gruesome, but jsut for debug print
297 instance Outputable IfaceRule where
298 ppr (IfaceRule { ifRuleName = name, ifActivation = act, ifRuleBndrs = bndrs,
299 ifRuleHead = fn, ifRuleArgs = args, ifRuleRhs = rhs })
300 = sep [hsep [doubleQuotes (ftext name), ppr act,
301 ptext SLIT("forall") <+> pprIfaceBndrs bndrs],
302 nest 2 (sep [ppr fn <+> sep (map (pprIfaceExpr parens) args),
303 ptext SLIT("=") <+> ppr rhs])
306 instance Outputable IfaceInst where
307 ppr (IfaceInst {ifDFun = dfun_id, ifOFlag = flag,
308 ifInstCls = cls, ifInstTys = mb_tcs})
309 = hang (ptext SLIT("instance") <+> ppr flag
310 <+> ppr cls <+> brackets (pprWithCommas ppr_mb mb_tcs))
311 2 (equals <+> ppr dfun_id)
314 ppr_mb (Just tc) = ppr tc
318 ----------------------------- Printing IfaceExpr ------------------------------------
321 instance Outputable IfaceExpr where
322 ppr e = pprIfaceExpr noParens e
324 pprIfaceExpr :: (SDoc -> SDoc) -> IfaceExpr -> SDoc
325 -- The function adds parens in context that need
326 -- an atomic value (e.g. function args)
328 pprIfaceExpr add_par (IfaceLcl v) = ppr v
329 pprIfaceExpr add_par (IfaceExt v) = ppr v
330 pprIfaceExpr add_par (IfaceLit l) = ppr l
331 pprIfaceExpr add_par (IfaceFCall cc ty) = braces (ppr cc <+> ppr ty)
332 pprIfaceExpr add_par (IfaceType ty) = char '@' <+> pprParendIfaceType ty
334 pprIfaceExpr add_par app@(IfaceApp _ _) = add_par (pprIfaceApp app [])
335 pprIfaceExpr add_par (IfaceTuple c as) = tupleParens c (interpp'SP as)
337 pprIfaceExpr add_par e@(IfaceLam _ _)
338 = add_par (sep [char '\\' <+> sep (map ppr bndrs) <+> arrow,
339 pprIfaceExpr noParens body])
341 (bndrs,body) = collect [] e
342 collect bs (IfaceLam b e) = collect (b:bs) e
343 collect bs e = (reverse bs, e)
346 pprIfaceExpr add_par (IfaceCase scrut bndr ty [(con, bs, rhs)])
348 = add_par (sep [ptext SLIT("case") <+> char '@' <+> pprParendIfaceType ty <+> pprIfaceExpr noParens scrut <+> ptext SLIT("of")
349 <+> ppr bndr <+> char '{' <+> ppr_con_bs con bs <+> arrow,
350 pprIfaceExpr noParens rhs <+> char '}'])
353 pprIfaceExpr add_par (IfaceCase scrut bndr ty alts)
355 = add_par (sep [ptext SLIT("case") <+> char '@' <+> pprParendIfaceType ty <+> pprIfaceExpr noParens scrut <+> ptext SLIT("of")
356 <+> ppr bndr <+> char '{',
357 nest 2 (sep (map ppr_alt alts)) <+> char '}'])
359 pprIfaceExpr add_par (IfaceCast expr co) = add_par (ptext SLIT("cast") <+> ppr expr <+> ppr co)
361 pprIfaceExpr add_par (IfaceLet (IfaceNonRec b rhs) body)
362 = add_par (sep [ptext SLIT("let {"),
363 nest 2 (ppr_bind (b, rhs)),
365 pprIfaceExpr noParens body])
367 pprIfaceExpr add_par (IfaceLet (IfaceRec pairs) body)
368 = add_par (sep [ptext SLIT("letrec {"),
369 nest 2 (sep (map ppr_bind pairs)),
371 pprIfaceExpr noParens body])
373 pprIfaceExpr add_par (IfaceNote note body) = add_par (ppr note <+> pprIfaceExpr parens body)
375 ppr_alt (con, bs, rhs) = sep [ppr_con_bs con bs,
376 arrow <+> pprIfaceExpr noParens rhs]
378 ppr_con_bs (IfaceTupleAlt tup_con) bs = tupleParens tup_con (interpp'SP bs)
379 ppr_con_bs con bs = ppr con <+> hsep (map ppr bs)
381 ppr_bind ((b,ty),rhs) = sep [ppr b <+> dcolon <+> ppr ty,
382 equals <+> pprIfaceExpr noParens rhs]
385 pprIfaceApp (IfaceApp fun arg) args = pprIfaceApp fun (nest 2 (pprIfaceExpr parens arg) : args)
386 pprIfaceApp fun args = sep (pprIfaceExpr parens fun : args)
389 instance Outputable IfaceNote where
390 ppr (IfaceSCC cc) = pprCostCentreCore cc
391 ppr IfaceInlineMe = ptext SLIT("__inline_me")
392 ppr (IfaceCoreNote s) = ptext SLIT("__core_note") <+> pprHsString (mkFastString s)
394 instance Outputable IfaceConAlt where
395 ppr IfaceDefault = text "DEFAULT"
396 ppr (IfaceLitAlt l) = ppr l
397 ppr (IfaceDataAlt d) = ppr d
398 ppr (IfaceTupleAlt b) = panic "ppr IfaceConAlt"
399 -- IfaceTupleAlt is handled by the case-alternative printer
402 instance Outputable IfaceIdInfo where
404 ppr (HasInfo is) = ptext SLIT("{-") <+> fsep (map ppr_hs_info is) <+> ptext SLIT("-}")
406 ppr_hs_info (HsUnfold unf) = ptext SLIT("Unfolding:") <+>
407 parens (pprIfaceExpr noParens unf)
408 ppr_hs_info (HsInline act) = ptext SLIT("Inline:") <+> ppr act
409 ppr_hs_info (HsArity arity) = ptext SLIT("Arity:") <+> int arity
410 ppr_hs_info (HsStrictness str) = ptext SLIT("Strictness:") <+> pprIfaceStrictSig str
411 ppr_hs_info HsNoCafRefs = ptext SLIT("HasNoCafRefs")
412 ppr_hs_info (HsWorker w a) = ptext SLIT("Worker:") <+> ppr w <+> int a
416 %************************************************************************
418 Equality, for interface file version generaion only
420 %************************************************************************
422 Equality over IfaceSyn returns an IfaceEq, not a Bool. The new constructor is
423 EqBut, which gives the set of *locally-defined* things whose version must be equal
424 for the whole thing to be equal. So the key function is eqIfExt, which compares
427 Of course, equality is also done modulo alpha conversion.
431 = Equal -- Definitely exactly the same
432 | NotEqual -- Definitely different
433 | EqBut OccSet -- The same provided these local things have not changed
435 bool :: Bool -> IfaceEq
437 bool False = NotEqual
439 toBool :: IfaceEq -> Bool
441 toBool (EqBut _) = True
442 toBool NotEqual = False
444 zapEq :: IfaceEq -> IfaceEq -- Used to forget EqBut information
445 zapEq (EqBut _) = Equal
448 (&&&) :: IfaceEq -> IfaceEq -> IfaceEq
450 NotEqual &&& x = NotEqual
451 EqBut occs &&& Equal = EqBut occs
452 EqBut occs &&& NotEqual = NotEqual
453 EqBut occs1 &&& EqBut occs2 = EqBut (occs1 `unionOccSets` occs2)
455 ---------------------
456 eqIfExt :: IfaceExtName -> IfaceExtName -> IfaceEq
457 -- This function is the core of the EqBut stuff
458 eqIfExt (ExtPkg mod1 occ1) (ExtPkg mod2 occ2) = bool (mod1==mod2 && occ1==occ2)
459 eqIfExt (HomePkg mod1 occ1 v1) (HomePkg mod2 occ2 v2) = bool (mod1==mod2 && occ1==occ2 && v1==v2)
460 eqIfExt (LocalTop occ1) (LocalTop occ2) | occ1 == occ2 = EqBut (unitOccSet occ1)
461 eqIfExt (LocalTopSub occ1 p1) (LocalTop occ2) | occ1 == occ2 = EqBut (unitOccSet p1)
462 eqIfExt (LocalTopSub occ1 p1) (LocalTopSub occ2 _) | occ1 == occ2 = EqBut (unitOccSet p1)
463 eqIfExt n1 n2 = NotEqual
468 ---------------------
469 checkBootDecl :: IfaceDecl -- The boot decl
470 -> IfaceDecl -- The real decl
471 -> Bool -- True <=> compatible
472 checkBootDecl (IfaceId s1 t1 _) (IfaceId s2 t2 _)
473 = ASSERT( s1==s2 ) toBool (t1 `eqIfType` t2)
475 checkBootDecl d1@(IfaceForeign {}) d2@(IfaceForeign {})
476 = ASSERT (ifName d1 == ifName d2 ) ifExtName d1 == ifExtName d2
478 checkBootDecl d1@(IfaceSyn {}) d2@(IfaceSyn {})
479 = ASSERT( ifName d1 == ifName d2 )
480 toBool $ eqWith (ifTyVars d1) (ifTyVars d2) $ \ env ->
481 eq_ifType env (ifSynRhs d1) (ifSynRhs d2)
483 checkBootDecl d1@(IfaceData {}) d2@(IfaceData {})
484 -- We don't check the recursion flags because the boot-one is
485 -- recursive, to be conservative, but the real one may not be.
486 -- I'm not happy with the way recursive flags are dealt with.
487 = ASSERT( ifName d1 == ifName d2 )
488 toBool $ eqWith (ifTyVars d1) (ifTyVars d2) $ \ env ->
489 eq_ifContext env (ifCtxt d1) (ifCtxt d2) &&&
491 IfAbstractTyCon -> Equal
492 cons1 -> eq_hsCD env cons1 (ifCons d2)
494 checkBootDecl d1@(IfaceClass {}) d2@(IfaceClass {})
495 = ASSERT( ifName d1 == ifName d2 )
496 toBool $ eqWith (ifTyVars d1) (ifTyVars d2) $ \ env ->
497 eqListBy (eq_hsFD env) (ifFDs d1) (ifFDs d2) &&&
498 case (ifCtxt d1, ifSigs d1) of
500 (cxt1, sigs1) -> eq_ifContext env cxt1 (ifCtxt d2) &&&
501 eqListBy (eq_cls_sig env) sigs1 (ifSigs d2)
503 checkBootDecl _ _ = False -- default case
505 ---------------------
506 eqIfDecl :: IfaceDecl -> IfaceDecl -> IfaceEq
507 eqIfDecl (IfaceId s1 t1 i1) (IfaceId s2 t2 i2)
508 = bool (s1 == s2) &&& (t1 `eqIfType` t2) &&& (i1 `eqIfIdInfo` i2)
510 eqIfDecl d1@(IfaceForeign {}) d2@(IfaceForeign {})
511 = bool (ifName d1 == ifName d2 && ifExtName d1 == ifExtName d2)
513 eqIfDecl d1@(IfaceData {}) d2@(IfaceData {})
514 = bool (ifName d1 == ifName d2 &&
515 ifRec d1 == ifRec d2 &&
516 ifVrcs d1 == ifVrcs d2 &&
517 ifGadtSyntax d1 == ifGadtSyntax d2 &&
518 ifGeneric d1 == ifGeneric d2) &&&
519 eqWith (ifTyVars d1) (ifTyVars d2) (\ env ->
520 eq_ifContext env (ifCtxt d1) (ifCtxt d2) &&&
521 eq_hsCD env (ifCons d1) (ifCons d2)
523 -- The type variables of the data type do not scope
524 -- over the constructors (any more), but they do scope
525 -- over the stupid context in the IfaceConDecls
527 eqIfDecl d1@(IfaceSyn {}) d2@(IfaceSyn {})
528 = bool (ifName d1 == ifName d2) &&&
529 eqWith (ifTyVars d1) (ifTyVars d2) (\ env ->
530 eq_ifType env (ifSynRhs d1) (ifSynRhs d2)
533 eqIfDecl d1@(IfaceClass {}) d2@(IfaceClass {})
534 = bool (ifName d1 == ifName d2 &&
535 ifRec d1 == ifRec d2 &&
536 ifVrcs d1 == ifVrcs d2) &&&
537 eqWith (ifTyVars d1) (ifTyVars d2) (\ env ->
538 eq_ifContext env (ifCtxt d1) (ifCtxt d2) &&&
539 eqListBy (eq_hsFD env) (ifFDs d1) (ifFDs d2) &&&
540 eqListBy (eq_cls_sig env) (ifSigs d1) (ifSigs d2)
543 eqIfDecl _ _ = NotEqual -- default case
546 eqWith :: [IfaceTvBndr] -> [IfaceTvBndr] -> (EqEnv -> IfaceEq) -> IfaceEq
547 eqWith = eq_ifTvBndrs emptyEqEnv
549 -----------------------
550 eqIfInst d1 d2 = bool (ifDFun d1 == ifDFun d2 && ifOFlag d1 == ifOFlag d2)
551 -- All other changes are handled via the version info on the dfun
553 eqIfRule (IfaceRule n1 a1 bs1 f1 es1 rhs1 o1)
554 (IfaceRule n2 a2 bs2 f2 es2 rhs2 o2)
555 = bool (n1==n2 && a1==a2 && o1 == o2) &&&
557 eq_ifBndrs emptyEqEnv bs1 bs2 (\env ->
558 zapEq (eqListBy (eq_ifaceExpr env) es1 es2) &&&
559 -- zapEq: for the LHSs, ignore the EqBut part
560 eq_ifaceExpr env rhs1 rhs2)
562 eq_hsCD env (IfDataTyCon c1) (IfDataTyCon c2)
563 = eqListBy (eq_ConDecl env) c1 c2
565 eq_hsCD env (IfNewTyCon c1) (IfNewTyCon c2) = eq_ConDecl env c1 c2
566 eq_hsCD env IfAbstractTyCon IfAbstractTyCon = Equal
567 eq_hsCD env d1 d2 = NotEqual
570 = bool (ifConOcc c1 == ifConOcc c2 &&
571 ifConInfix c1 == ifConInfix c2 &&
572 ifConStricts c1 == ifConStricts c2 &&
573 ifConFields c1 == ifConFields c2) &&&
574 eq_ifTvBndrs env (ifConUnivTvs c1) (ifConUnivTvs c2) (\ env ->
575 eq_ifTvBndrs env (ifConExTvs c1) (ifConExTvs c2) (\ env ->
576 eq_ifContext env (ifConCtxt c1) (ifConCtxt c2) &&&
577 eq_ifTypes env (ifConArgTys c1) (ifConArgTys c2)))
579 eq_hsFD env (ns1,ms1) (ns2,ms2)
580 = eqListBy (eqIfOcc env) ns1 ns2 &&& eqListBy (eqIfOcc env) ms1 ms2
582 eq_cls_sig env (IfaceClassOp n1 dm1 ty1) (IfaceClassOp n2 dm2 ty2)
583 = bool (n1==n2 && dm1 == dm2) &&& eq_ifType env ty1 ty2
589 eqIfIdInfo NoInfo NoInfo = Equal
590 eqIfIdInfo (HasInfo is1) (HasInfo is2) = eqListBy eq_item is1 is2
591 eqIfIdInfo i1 i2 = NotEqual
593 eq_item (HsInline a1) (HsInline a2) = bool (a1 == a2)
594 eq_item (HsArity a1) (HsArity a2) = bool (a1 == a2)
595 eq_item (HsStrictness s1) (HsStrictness s2) = bool (s1 == s2)
596 eq_item (HsUnfold u1) (HsUnfold u2) = eq_ifaceExpr emptyEqEnv u1 u2
597 eq_item HsNoCafRefs HsNoCafRefs = Equal
598 eq_item (HsWorker wkr1 a1) (HsWorker wkr2 a2) = bool (a1==a2) &&& (wkr1 `eqIfExt` wkr2)
599 eq_item _ _ = NotEqual
602 eq_ifaceExpr :: EqEnv -> IfaceExpr -> IfaceExpr -> IfaceEq
603 eq_ifaceExpr env (IfaceLcl v1) (IfaceLcl v2) = eqIfOcc env v1 v2
604 eq_ifaceExpr env (IfaceExt v1) (IfaceExt v2) = eqIfExt v1 v2
605 eq_ifaceExpr env (IfaceLit l1) (IfaceLit l2) = bool (l1 == l2)
606 eq_ifaceExpr env (IfaceFCall c1 ty1) (IfaceFCall c2 ty2) = bool (c1==c2) &&& eq_ifType env ty1 ty2
607 eq_ifaceExpr env (IfaceType ty1) (IfaceType ty2) = eq_ifType env ty1 ty2
608 eq_ifaceExpr env (IfaceTuple n1 as1) (IfaceTuple n2 as2) = bool (n1==n2) &&& eqListBy (eq_ifaceExpr env) as1 as2
609 eq_ifaceExpr env (IfaceLam b1 body1) (IfaceLam b2 body2) = eq_ifBndr env b1 b2 (\env -> eq_ifaceExpr env body1 body2)
610 eq_ifaceExpr env (IfaceApp f1 a1) (IfaceApp f2 a2) = eq_ifaceExpr env f1 f2 &&& eq_ifaceExpr env a1 a2
611 eq_ifaceExpr env (IfaceCast e1 co1) (IfaceCast e2 co2) = eq_ifaceExpr env e1 e2 &&& eq_ifType env co1 co2
612 eq_ifaceExpr env (IfaceNote n1 r1) (IfaceNote n2 r2) = eq_ifaceNote env n1 n2 &&& eq_ifaceExpr env r1 r2
614 eq_ifaceExpr env (IfaceCase s1 b1 ty1 as1) (IfaceCase s2 b2 ty2 as2)
615 = eq_ifaceExpr env s1 s2 &&&
616 eq_ifType env ty1 ty2 &&&
617 eq_ifNakedBndr env b1 b2 (\env -> eqListBy (eq_ifaceAlt env) as1 as2)
619 eq_ifaceAlt env (c1,bs1,r1) (c2,bs2,r2)
620 = bool (eq_ifaceConAlt c1 c2) &&&
621 eq_ifNakedBndrs env bs1 bs2 (\env -> eq_ifaceExpr env r1 r2)
623 eq_ifaceExpr env (IfaceLet (IfaceNonRec b1 r1) x1) (IfaceLet (IfaceNonRec b2 r2) x2)
624 = eq_ifaceExpr env r1 r2 &&& eq_ifIdBndr env b1 b2 (\env -> eq_ifaceExpr env x1 x2)
626 eq_ifaceExpr env (IfaceLet (IfaceRec as1) x1) (IfaceLet (IfaceRec as2) x2)
627 = eq_ifIdBndrs env bs1 bs2 (\env -> eqListBy (eq_ifaceExpr env) rs1 rs2 &&& eq_ifaceExpr env x1 x2)
629 (bs1,rs1) = unzip as1
630 (bs2,rs2) = unzip as2
633 eq_ifaceExpr env _ _ = NotEqual
636 eq_ifaceConAlt :: IfaceConAlt -> IfaceConAlt -> Bool
637 eq_ifaceConAlt IfaceDefault IfaceDefault = True
638 eq_ifaceConAlt (IfaceDataAlt n1) (IfaceDataAlt n2) = n1==n2
639 eq_ifaceConAlt (IfaceTupleAlt c1) (IfaceTupleAlt c2) = c1==c2
640 eq_ifaceConAlt (IfaceLitAlt l1) (IfaceLitAlt l2) = l1==l2
641 eq_ifaceConAlt _ _ = False
644 eq_ifaceNote :: EqEnv -> IfaceNote -> IfaceNote -> IfaceEq
645 eq_ifaceNote env (IfaceSCC c1) (IfaceSCC c2) = bool (c1==c2)
646 eq_ifaceNote env IfaceInlineMe IfaceInlineMe = Equal
647 eq_ifaceNote env (IfaceCoreNote s1) (IfaceCoreNote s2) = bool (s1==s2)
648 eq_ifaceNote env _ _ = NotEqual
652 ---------------------
653 eqIfType t1 t2 = eq_ifType emptyEqEnv t1 t2
656 eq_ifType env (IfaceTyVar n1) (IfaceTyVar n2) = eqIfOcc env n1 n2
657 eq_ifType env (IfaceAppTy s1 t1) (IfaceAppTy s2 t2) = eq_ifType env s1 s2 &&& eq_ifType env t1 t2
658 eq_ifType env (IfacePredTy st1) (IfacePredTy st2) = eq_ifPredType env st1 st2
659 eq_ifType env (IfaceTyConApp tc1 ts1) (IfaceTyConApp tc2 ts2) = tc1 `eqIfTc` tc2 &&& eq_ifTypes env ts1 ts2
660 eq_ifType env (IfaceForAllTy tv1 t1) (IfaceForAllTy tv2 t2) = eq_ifTvBndr env tv1 tv2 (\env -> eq_ifType env t1 t2)
661 eq_ifType env (IfaceFunTy s1 t1) (IfaceFunTy s2 t2) = eq_ifType env s1 s2 &&& eq_ifType env t1 t2
662 eq_ifType env _ _ = NotEqual
665 eq_ifTypes env = eqListBy (eq_ifType env)
668 eq_ifContext env a b = eqListBy (eq_ifPredType env) a b
671 eq_ifPredType env (IfaceClassP c1 tys1) (IfaceClassP c2 tys2) = c1 `eqIfExt` c2 &&& eq_ifTypes env tys1 tys2
672 eq_ifPredType env (IfaceIParam n1 ty1) (IfaceIParam n2 ty2) = bool (n1 == n2) &&& eq_ifType env ty1 ty2
673 eq_ifPredType env _ _ = NotEqual
676 eqIfTc (IfaceTc tc1) (IfaceTc tc2) = tc1 `eqIfExt` tc2
677 eqIfTc IfaceIntTc IfaceIntTc = Equal
678 eqIfTc IfaceCharTc IfaceCharTc = Equal
679 eqIfTc IfaceBoolTc IfaceBoolTc = Equal
680 eqIfTc IfaceListTc IfaceListTc = Equal
681 eqIfTc IfacePArrTc IfacePArrTc = Equal
682 eqIfTc (IfaceTupTc bx1 ar1) (IfaceTupTc bx2 ar2) = bool (bx1==bx2 && ar1==ar2)
683 eqIfTc _ _ = NotEqual
686 -----------------------------------------------------------
687 Support code for equality checking
688 -----------------------------------------------------------
691 ------------------------------------
692 type EqEnv = UniqFM FastString -- Tracks the mapping from L-variables to R-variables
694 eqIfOcc :: EqEnv -> FastString -> FastString -> IfaceEq
695 eqIfOcc env n1 n2 = case lookupUFM env n1 of
696 Just n1 -> bool (n1 == n2)
697 Nothing -> bool (n1 == n2)
699 extendEqEnv :: EqEnv -> FastString -> FastString -> EqEnv
700 extendEqEnv env n1 n2 | n1 == n2 = env
701 | otherwise = addToUFM env n1 n2
704 emptyEqEnv = emptyUFM
706 ------------------------------------
707 type ExtEnv bndr = EqEnv -> bndr -> bndr -> (EqEnv -> IfaceEq) -> IfaceEq
709 eq_ifNakedBndr :: ExtEnv FastString
710 eq_ifBndr :: ExtEnv IfaceBndr
711 eq_ifTvBndr :: ExtEnv IfaceTvBndr
712 eq_ifIdBndr :: ExtEnv IfaceIdBndr
714 eq_ifNakedBndr env n1 n2 k = k (extendEqEnv env n1 n2)
716 eq_ifBndr env (IfaceIdBndr b1) (IfaceIdBndr b2) k = eq_ifIdBndr env b1 b2 k
717 eq_ifBndr env (IfaceTvBndr b1) (IfaceTvBndr b2) k = eq_ifTvBndr env b1 b2 k
718 eq_ifBndr _ _ _ _ = NotEqual
720 eq_ifTvBndr env (v1, k1) (v2, k2) k = eq_ifType env k1 k2 &&& k (extendEqEnv env v1 v2)
721 eq_ifIdBndr env (v1, t1) (v2, t2) k = eq_ifType env t1 t2 &&& k (extendEqEnv env v1 v2)
723 eq_ifBndrs :: ExtEnv [IfaceBndr]
724 eq_ifIdBndrs :: ExtEnv [IfaceIdBndr]
725 eq_ifTvBndrs :: ExtEnv [IfaceTvBndr]
726 eq_ifNakedBndrs :: ExtEnv [FastString]
727 eq_ifBndrs = eq_bndrs_with eq_ifBndr
728 eq_ifIdBndrs = eq_bndrs_with eq_ifIdBndr
729 eq_ifTvBndrs = eq_bndrs_with eq_ifTvBndr
730 eq_ifNakedBndrs = eq_bndrs_with eq_ifNakedBndr
732 eq_bndrs_with eq env [] [] k = k env
733 eq_bndrs_with eq env (b1:bs1) (b2:bs2) k = eq env b1 b2 (\env -> eq_bndrs_with eq env bs1 bs2 k)
734 eq_bndrs_with eq env _ _ _ = NotEqual
738 eqListBy :: (a->a->IfaceEq) -> [a] -> [a] -> IfaceEq
739 eqListBy eq [] [] = Equal
740 eqListBy eq (x:xs) (y:ys) = eq x y &&& eqListBy eq xs ys
741 eqListBy eq xs ys = NotEqual
743 eqMaybeBy :: (a->a->IfaceEq) -> Maybe a -> Maybe a -> IfaceEq
744 eqMaybeBy eq Nothing Nothing = Equal
745 eqMaybeBy eq (Just x) (Just y) = eq x y
746 eqMaybeBy eq x y = NotEqual