2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section[HsDecls]{Abstract syntax: global declarations}
6 Definitions for: @TyDecl@ and @oCnDecl@, @ClassDecl@,
7 @InstDecl@, @DefaultDecl@ and @ForeignDecl@.
11 HsDecl(..), LHsDecl, TyClDecl(..), LTyClDecl,
12 InstDecl(..), LInstDecl, NewOrData(..),
13 RuleDecl(..), LRuleDecl, RuleBndr(..),
14 DefaultDecl(..), LDefaultDecl, SpliceDecl(..),
15 ForeignDecl(..), LForeignDecl, ForeignImport(..), ForeignExport(..),
16 CImportSpec(..), FoType(..),
17 ConDecl(..), ResType(..), LConDecl,
18 DeprecDecl(..), LDeprecDecl,
19 HsGroup(..), emptyRdrGroup, emptyRnGroup, appendGroups,
20 tcdName, tyClDeclNames, tyClDeclTyVars,
21 isClassDecl, isSynDecl, isDataDecl,
25 collectRuleBndrSigTys,
28 #include "HsVersions.h"
31 import {-# SOURCE #-} HsExpr( HsExpr, pprExpr )
32 -- Because Expr imports Decls via HsBracket
34 import HsBinds ( HsValBinds(..), HsBind, LHsBinds, plusHsValBinds,
35 Sig(..), LSig, LFixitySig, pprLHsBinds,
36 emptyValBindsIn, emptyValBindsOut )
37 import HsPat ( HsConDetails(..), hsConArgs )
38 import HsImpExp ( pprHsVar )
40 import NameSet ( NameSet )
41 import HscTypes ( DeprecTxt )
42 import CoreSyn ( RuleName )
43 import Kind ( Kind, pprKind )
44 import BasicTypes ( Activation(..) )
45 import ForeignCall ( CCallTarget(..), DNCallSpec, CCallConv, Safety,
46 CExportSpec(..), CLabelString )
49 import FunDeps ( pprFundeps )
50 import Class ( FunDep )
53 import SrcLoc ( Located(..), unLoc, noLoc )
58 %************************************************************************
60 \subsection[HsDecl]{Declarations}
62 %************************************************************************
65 type LHsDecl id = Located (HsDecl id)
72 | DefD (DefaultDecl id)
73 | ForD (ForeignDecl id)
74 | DeprecD (DeprecDecl id)
76 | SpliceD (SpliceDecl id)
78 -- NB: all top-level fixity decls are contained EITHER
80 -- OR in the ClassDecls in TyClDs
83 -- a) data constructors
84 -- b) class methods (but they can be also done in the
85 -- signatures of class decls)
86 -- c) imported functions (that have an IfacSig)
89 -- The latter is for class methods only
91 -- A [HsDecl] is categorised into a HsGroup before being
92 -- fed to the renamer.
95 hs_valds :: HsValBinds id,
96 hs_tyclds :: [LTyClDecl id],
97 hs_instds :: [LInstDecl id],
99 hs_fixds :: [LFixitySig id],
100 -- Snaffled out of both top-level fixity signatures,
101 -- and those in class declarations
103 hs_defds :: [LDefaultDecl id],
104 hs_fords :: [LForeignDecl id],
105 hs_depds :: [LDeprecDecl id],
106 hs_ruleds :: [LRuleDecl id]
109 emptyGroup, emptyRdrGroup, emptyRnGroup :: HsGroup a
110 emptyRdrGroup = emptyGroup { hs_valds = emptyValBindsIn }
111 emptyRnGroup = emptyGroup { hs_valds = emptyValBindsOut }
113 emptyGroup = HsGroup { hs_tyclds = [], hs_instds = [],
114 hs_fixds = [], hs_defds = [], hs_fords = [],
115 hs_depds = [], hs_ruleds = [],
116 hs_valds = error "emptyGroup hs_valds: Can't happen" }
118 appendGroups :: HsGroup a -> HsGroup a -> HsGroup a
121 hs_valds = val_groups1,
130 hs_valds = val_groups2,
140 hs_valds = val_groups1 `plusHsValBinds` val_groups2,
141 hs_tyclds = tyclds1 ++ tyclds2,
142 hs_instds = instds1 ++ instds2,
143 hs_fixds = fixds1 ++ fixds2,
144 hs_defds = defds1 ++ defds2,
145 hs_fords = fords1 ++ fords2,
146 hs_depds = depds1 ++ depds2,
147 hs_ruleds = rulds1 ++ rulds2 }
151 instance OutputableBndr name => Outputable (HsDecl name) where
152 ppr (TyClD dcl) = ppr dcl
153 ppr (ValD binds) = ppr binds
154 ppr (DefD def) = ppr def
155 ppr (InstD inst) = ppr inst
156 ppr (ForD fd) = ppr fd
157 ppr (SigD sd) = ppr sd
158 ppr (RuleD rd) = ppr rd
159 ppr (DeprecD dd) = ppr dd
160 ppr (SpliceD dd) = ppr dd
162 instance OutputableBndr name => Outputable (HsGroup name) where
163 ppr (HsGroup { hs_valds = val_decls,
164 hs_tyclds = tycl_decls,
165 hs_instds = inst_decls,
166 hs_fixds = fix_decls,
167 hs_depds = deprec_decls,
168 hs_fords = foreign_decls,
169 hs_defds = default_decls,
170 hs_ruleds = rule_decls })
171 = vcat [ppr_ds fix_decls, ppr_ds default_decls,
172 ppr_ds deprec_decls, ppr_ds rule_decls,
174 ppr_ds tycl_decls, ppr_ds inst_decls,
175 ppr_ds foreign_decls]
178 ppr_ds ds = text "" $$ vcat (map ppr ds)
180 data SpliceDecl id = SpliceDecl (Located (HsExpr id)) -- Top level splice
182 instance OutputableBndr name => Outputable (SpliceDecl name) where
183 ppr (SpliceDecl e) = ptext SLIT("$") <> parens (pprExpr (unLoc e))
187 %************************************************************************
189 \subsection[TyDecl]{@data@, @newtype@ or @type@ (synonym) type declaration}
191 %************************************************************************
193 --------------------------------
195 --------------------------------
197 Here is the story about the implicit names that go with type, class,
198 and instance decls. It's a bit tricky, so pay attention!
200 "Implicit" (or "system") binders
201 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
202 Each data type decl defines
203 a worker name for each constructor
204 to-T and from-T convertors
205 Each class decl defines
206 a tycon for the class
207 a data constructor for that tycon
208 the worker for that constructor
209 a selector for each superclass
211 All have occurrence names that are derived uniquely from their parent
214 None of these get separate definitions in an interface file; they are
215 fully defined by the data or class decl. But they may *occur* in
216 interface files, of course. Any such occurrence must haul in the
217 relevant type or class decl.
220 - Ensure they "point to" the parent data/class decl
221 when loading that decl from an interface file
222 (See RnHiFiles.getSysBinders)
224 - When typechecking the decl, we build the implicit TyCons and Ids.
225 When doing so we look them up in the name cache (RnEnv.lookupSysName),
226 to ensure correct module and provenance is set
228 These are the two places that we have to conjure up the magic derived
229 names. (The actual magic is in OccName.mkWorkerOcc, etc.)
233 - Occurrence name is derived uniquely from the method name
236 - If there is a default method name at all, it's recorded in
237 the ClassOpSig (in HsBinds), in the DefMeth field.
238 (DefMeth is defined in Class.lhs)
240 Source-code class decls and interface-code class decls are treated subtly
241 differently, which has given me a great deal of confusion over the years.
242 Here's the deal. (We distinguish the two cases because source-code decls
243 have (Just binds) in the tcdMeths field, whereas interface decls have Nothing.
245 In *source-code* class declarations:
247 - When parsing, every ClassOpSig gets a DefMeth with a suitable RdrName
248 This is done by RdrHsSyn.mkClassOpSigDM
250 - The renamer renames it to a Name
252 - During typechecking, we generate a binding for each $dm for
253 which there's a programmer-supplied default method:
258 We generate a binding for $dmop1 but not for $dmop2.
259 The Class for Foo has a NoDefMeth for op2 and a DefMeth for op1.
260 The Name for $dmop2 is simply discarded.
262 In *interface-file* class declarations:
263 - When parsing, we see if there's an explicit programmer-supplied default method
264 because there's an '=' sign to indicate it:
266 op1 = :: <type> -- NB the '='
268 We use this info to generate a DefMeth with a suitable RdrName for op1,
269 and a NoDefMeth for op2
270 - The interface file has a separate definition for $dmop1, with unfolding etc.
271 - The renamer renames it to a Name.
272 - The renamer treats $dmop1 as a free variable of the declaration, so that
273 the binding for $dmop1 will be sucked in. (See RnHsSyn.tyClDeclFVs)
274 This doesn't happen for source code class decls, because they *bind* the default method.
278 Each instance declaration gives rise to one dictionary function binding.
280 The type checker makes up new source-code instance declarations
281 (e.g. from 'deriving' or generic default methods --- see
282 TcInstDcls.tcInstDecls1). So we can't generate the names for
283 dictionary functions in advance (we don't know how many we need).
285 On the other hand for interface-file instance declarations, the decl
286 specifies the name of the dictionary function, and it has a binding elsewhere
287 in the interface file:
288 instance {Eq Int} = dEqInt
289 dEqInt :: {Eq Int} <pragma info>
291 So again we treat source code and interface file code slightly differently.
294 - Source code instance decls have a Nothing in the (Maybe name) field
295 (see data InstDecl below)
297 - The typechecker makes up a Local name for the dict fun for any source-code
298 instance decl, whether it comes from a source-code instance decl, or whether
299 the instance decl is derived from some other construct (e.g. 'deriving').
301 - The occurrence name it chooses is derived from the instance decl (just for
302 documentation really) --- e.g. dNumInt. Two dict funs may share a common
303 occurrence name, but will have different uniques. E.g.
304 instance Foo [Int] where ...
305 instance Foo [Bool] where ...
306 These might both be dFooList
308 - The CoreTidy phase externalises the name, and ensures the occurrence name is
309 unique (this isn't special to dict funs). So we'd get dFooList and dFooList1.
311 - We can take this relaxed approach (changing the occurrence name later)
312 because dict fun Ids are not captured in a TyCon or Class (unlike default
313 methods, say). Instead, they are kept separately in the InstEnv. This
314 makes it easy to adjust them after compiling a module. (Once we've finished
315 compiling that module, they don't change any more.)
319 - The instance decl gives the dict fun name, so the InstDecl has a (Just name)
320 in the (Maybe name) field.
322 - RnHsSyn.instDeclFVs treats the dict fun name as free in the decl, so that we
323 suck in the dfun binding
327 -- TyClDecls are precisely the kind of declarations that can
328 -- appear in interface files; or (internally) in GHC's interface
329 -- for a module. That's why (despite the misnomer) IfaceSig and ForeignType
330 -- are both in TyClDecl
332 type LTyClDecl name = Located (TyClDecl name)
336 tcdLName :: Located name,
337 tcdExtName :: Maybe FastString,
341 | TyData { tcdND :: NewOrData,
342 tcdCtxt :: LHsContext name, -- Context
343 tcdLName :: Located name, -- Type constructor
344 tcdTyVars :: [LHsTyVarBndr name], -- Type variables
345 tcdTyPats :: Maybe [LHsType name], -- Type patterns
346 tcdKindSig:: Maybe Kind, -- Optional kind sig;
347 -- (only for the 'where' form)
349 tcdCons :: [LConDecl name], -- Data constructors
350 -- For data T a = T1 | T2 a the LConDecls all have ResTyH98
351 -- For data T a where { T1 :: T a } the LConDecls all have ResTyGADT
353 tcdDerivs :: Maybe [LHsType name]
354 -- Derivings; Nothing => not specified
355 -- Just [] => derive exactly what is asked
356 -- These "types" must be of form
357 -- forall ab. C ty1 ty2
358 -- Typically the foralls and ty args are empty, but they
359 -- are non-empty for the newtype-deriving case
362 | TySynonym { tcdLName :: Located name, -- type constructor
363 tcdTyVars :: [LHsTyVarBndr name], -- type variables
364 tcdSynRhs :: LHsType name -- synonym expansion
367 | ClassDecl { tcdCtxt :: LHsContext name, -- Context...
368 tcdLName :: Located name, -- Name of the class
369 tcdTyVars :: [LHsTyVarBndr name], -- Class type variables
370 tcdFDs :: [Located (FunDep name)], -- Functional deps
371 tcdSigs :: [LSig name], -- Methods' signatures
372 tcdMeths :: LHsBinds name, -- Default methods
373 tcdATs :: [LTyClDecl name] -- Associated types; ie
379 = NewType -- "newtype Blah ..."
380 | DataType -- "data Blah ..."
381 deriving( Eq ) -- Needed because Demand derives Eq
387 isDataDecl, isSynDecl, isClassDecl :: TyClDecl name -> Bool
389 isSynDecl (TySynonym {}) = True
390 isSynDecl other = False
392 isDataDecl (TyData {}) = True
393 isDataDecl other = False
395 isClassDecl (ClassDecl {}) = True
396 isClassDecl other = False
402 tcdName :: TyClDecl name -> name
403 tcdName decl = unLoc (tcdLName decl)
405 tyClDeclNames :: Eq name => TyClDecl name -> [Located name]
406 -- Returns all the *binding* names of the decl, along with their SrcLocs
407 -- The first one is guaranteed to be the name of the decl
408 -- For record fields, the first one counts as the SrcLoc
409 -- We use the equality to filter out duplicate field names
411 tyClDeclNames (TySynonym {tcdLName = name}) = [name]
412 tyClDeclNames (ForeignType {tcdLName = name}) = [name]
414 tyClDeclNames (ClassDecl {tcdLName = cls_name, tcdSigs = sigs, tcdATs = ats})
416 concatMap (tyClDeclNames . unLoc) ats ++ [n | L _ (TypeSig n _) <- sigs]
418 tyClDeclNames (TyData {tcdLName = tc_name, tcdCons = cons})
419 = tc_name : conDeclsNames (map unLoc cons)
421 tyClDeclTyVars (TySynonym {tcdTyVars = tvs}) = tvs
422 tyClDeclTyVars (TyData {tcdTyVars = tvs}) = tvs
423 tyClDeclTyVars (ClassDecl {tcdTyVars = tvs}) = tvs
424 tyClDeclTyVars (ForeignType {}) = []
428 countTyClDecls :: [TyClDecl name] -> (Int, Int, Int, Int)
429 -- class, data, newtype, synonym decls
431 = (count isClassDecl decls,
432 count isSynDecl decls,
433 count isDataTy decls,
436 isDataTy TyData{tcdND=DataType} = True
439 isNewTy TyData{tcdND=NewType} = True
444 instance OutputableBndr name
445 => Outputable (TyClDecl name) where
447 ppr (ForeignType {tcdLName = ltycon})
448 = hsep [ptext SLIT("foreign import type dotnet"), ppr ltycon]
450 ppr (TySynonym {tcdLName = ltycon, tcdTyVars = tyvars, tcdSynRhs = mono_ty})
451 = hang (ptext SLIT("type") <+> pp_decl_head [] ltycon tyvars Nothing <+> equals)
454 ppr (TyData {tcdND = new_or_data, tcdCtxt = context, tcdLName = ltycon,
455 tcdTyVars = tyvars, tcdTyPats = typats, tcdKindSig = mb_sig,
456 tcdCons = condecls, tcdDerivs = derivings})
457 = pp_tydecl (ppr new_or_data <+>
458 pp_decl_head (unLoc context) ltycon tyvars typats <+>
460 (pp_condecls condecls)
463 ppr_sig Nothing = empty
464 ppr_sig (Just kind) = dcolon <+> pprKind kind
466 ppr (ClassDecl {tcdCtxt = context, tcdLName = lclas, tcdTyVars = tyvars,
468 tcdSigs = sigs, tcdMeths = methods, tcdATs = ats})
469 | null sigs && null ats -- No "where" part
472 | otherwise -- Laid out
473 = sep [hsep [top_matter, ptext SLIT("where {")],
474 nest 4 (sep [ sep (map ppr_semi ats)
475 , sep (map ppr_semi sigs)
476 , pprLHsBinds methods
479 top_matter = ptext SLIT("class")
480 <+> pp_decl_head (unLoc context) lclas tyvars Nothing
481 <+> pprFundeps (map unLoc fds)
482 ppr_semi decl = ppr decl <> semi
484 pp_decl_head :: OutputableBndr name
487 -> [LHsTyVarBndr name]
488 -> Maybe [LHsType name]
490 pp_decl_head context thing tyvars Nothing -- no explicit type patterns
491 = hsep [pprHsContext context, ppr thing, interppSP tyvars]
492 pp_decl_head context thing _ (Just typats) -- explicit type patterns
493 = hsep [ pprHsContext context, ppr thing
494 , hsep (map (pprParendHsType.unLoc) typats)]
496 pp_condecls cs@(L _ ConDecl{ con_res = ResTyGADT _ } : _) -- In GADT syntax
497 = hang (ptext SLIT("where")) 2 (vcat (map ppr cs))
498 pp_condecls cs -- In H98 syntax
499 = equals <+> sep (punctuate (ptext SLIT(" |")) (map ppr cs))
501 pp_tydecl pp_head pp_decl_rhs derivings
502 = hang pp_head 4 (sep [
506 Just ds -> hsep [ptext SLIT("deriving"), parens (interpp'SP ds)]
509 instance Outputable NewOrData where
510 ppr NewType = ptext SLIT("newtype")
511 ppr DataType = ptext SLIT("data")
515 %************************************************************************
517 \subsection[ConDecl]{A data-constructor declaration}
519 %************************************************************************
522 type LConDecl name = Located (ConDecl name)
524 -- data T b = forall a. Eq a => MkT a b
525 -- MkT :: forall b a. Eq a => MkT a b
528 -- MkT1 :: Int -> T Int
530 -- data T = Int `MkT` Int
534 -- Int `MkT` Int :: T Int
538 { con_name :: Located name -- Constructor name; this is used for the
539 -- DataCon itself, and for the user-callable wrapper Id
541 , con_explicit :: HsExplicitForAll -- Is there an user-written forall? (cf. HStypes.HsForAllTy)
543 , con_qvars :: [LHsTyVarBndr name] -- ResTyH98: the constructor's existential type variables
544 -- ResTyGADT: all the constructor's quantified type variables
546 , con_cxt :: LHsContext name -- The context. This *does not* include the
547 -- "stupid theta" which lives only in the TyData decl
549 , con_details :: HsConDetails name (LBangType name) -- The main payload
551 , con_res :: ResType name -- Result type of the constructor
555 = ResTyH98 -- Constructor was declared using Haskell 98 syntax
556 | ResTyGADT (LHsType name) -- Constructor was declared using GADT-style syntax,
557 -- and here is its result type
561 conDeclsNames :: Eq name => [ConDecl name] -> [Located name]
562 -- See tyClDeclNames for what this does
563 -- The function is boringly complicated because of the records
564 -- And since we only have equality, we have to be a little careful
566 = snd (foldl do_one ([], []) cons)
568 do_one (flds_seen, acc) (ConDecl { con_name = lname, con_details = RecCon flds })
569 = (map unLoc new_flds ++ flds_seen, lname : [f | f <- new_flds] ++ acc)
571 new_flds = [ f | (f,_) <- flds, not (unLoc f `elem` flds_seen) ]
573 do_one (flds_seen, acc) c
574 = (flds_seen, (con_name c):acc)
576 conDetailsTys details = map getBangType (hsConArgs details)
581 instance (OutputableBndr name) => Outputable (ConDecl name) where
584 pprConDecl (ConDecl con expl tvs cxt details ResTyH98)
585 = sep [pprHsForAll expl tvs cxt, ppr_details con details]
587 ppr_details con (InfixCon t1 t2) = hsep [ppr t1, pprHsVar con, ppr t2]
588 ppr_details con (PrefixCon tys) = hsep (pprHsVar con : map ppr tys)
589 ppr_details con (RecCon fields) = ppr con <+> ppr_fields fields
591 pprConDecl (ConDecl con expl tvs cxt (PrefixCon arg_tys) (ResTyGADT res_ty))
592 = ppr con <+> dcolon <+>
593 sep [pprHsForAll expl tvs cxt, ppr (foldr mk_fun_ty res_ty arg_tys)]
595 mk_fun_ty a b = noLoc (HsFunTy a b)
596 pprConDecl (ConDecl con expl tvs cxt (RecCon fields) (ResTyGADT res_ty))
597 = sep [pprHsForAll expl tvs cxt, ppr con <+> ppr fields <+> dcolon <+> ppr res_ty]
599 ppr_fields fields = braces (sep (punctuate comma (map ppr_field fields)))
600 ppr_field (n, ty) = ppr n <+> dcolon <+> ppr ty
603 %************************************************************************
605 \subsection[InstDecl]{An instance declaration
607 %************************************************************************
610 type LInstDecl name = Located (InstDecl name)
613 = InstDecl (LHsType name) -- Context => Class Instance-type
614 -- Using a polytype means that the renamer conveniently
615 -- figures out the quantified type variables for us.
617 [LSig name] -- User-supplied pragmatic info
618 [LTyClDecl name]-- Associated types
620 instance (OutputableBndr name) => Outputable (InstDecl name) where
622 ppr (InstDecl inst_ty binds uprags ats)
623 = vcat [hsep [ptext SLIT("instance"), ppr inst_ty, ptext SLIT("where")],
626 nest 4 (pprLHsBinds binds) ]
628 -- Extract the declarations of associated types from an instance
630 instDeclATs :: InstDecl name -> [LTyClDecl name]
631 instDeclATs (InstDecl _ _ _ ats) = ats
634 %************************************************************************
636 \subsection[DefaultDecl]{A @default@ declaration}
638 %************************************************************************
640 There can only be one default declaration per module, but it is hard
641 for the parser to check that; we pass them all through in the abstract
642 syntax, and that restriction must be checked in the front end.
645 type LDefaultDecl name = Located (DefaultDecl name)
647 data DefaultDecl name
648 = DefaultDecl [LHsType name]
650 instance (OutputableBndr name)
651 => Outputable (DefaultDecl name) where
653 ppr (DefaultDecl tys)
654 = ptext SLIT("default") <+> parens (interpp'SP tys)
657 %************************************************************************
659 \subsection{Foreign function interface declaration}
661 %************************************************************************
665 -- foreign declarations are distinguished as to whether they define or use a
668 -- * the Boolean value indicates whether the pre-standard deprecated syntax
671 type LForeignDecl name = Located (ForeignDecl name)
673 data ForeignDecl name
674 = ForeignImport (Located name) (LHsType name) ForeignImport -- defines name
675 | ForeignExport (Located name) (LHsType name) ForeignExport -- uses name
677 -- Specification Of an imported external entity in dependence on the calling
680 data ForeignImport = -- import of a C entity
682 -- * the two strings specifying a header file or library
683 -- may be empty, which indicates the absence of a
684 -- header or object specification (both are not used
685 -- in the case of `CWrapper' and when `CFunction'
686 -- has a dynamic target)
688 -- * the calling convention is irrelevant for code
689 -- generation in the case of `CLabel', but is needed
690 -- for pretty printing
692 -- * `Safety' is irrelevant for `CLabel' and `CWrapper'
694 CImport CCallConv -- ccall or stdcall
695 Safety -- safe or unsafe
696 FastString -- name of C header
697 FastString -- name of library object
698 CImportSpec -- details of the C entity
700 -- import of a .NET function
702 | DNImport DNCallSpec
704 -- details of an external C entity
706 data CImportSpec = CLabel CLabelString -- import address of a C label
707 | CFunction CCallTarget -- static or dynamic function
708 | CWrapper -- wrapper to expose closures
711 -- specification of an externally exported entity in dependence on the calling
714 data ForeignExport = CExport CExportSpec -- contains the calling convention
715 | DNExport -- presently unused
717 -- abstract type imported from .NET
719 data FoType = DNType -- In due course we'll add subtype stuff
720 deriving (Eq) -- Used for equality instance for TyClDecl
723 -- pretty printing of foreign declarations
726 instance OutputableBndr name => Outputable (ForeignDecl name) where
727 ppr (ForeignImport n ty fimport) =
728 ptext SLIT("foreign import") <+> ppr fimport <+>
729 ppr n <+> dcolon <+> ppr ty
730 ppr (ForeignExport n ty fexport) =
731 ptext SLIT("foreign export") <+> ppr fexport <+>
732 ppr n <+> dcolon <+> ppr ty
734 instance Outputable ForeignImport where
735 ppr (DNImport spec) =
736 ptext SLIT("dotnet") <+> ppr spec
737 ppr (CImport cconv safety header lib spec) =
738 ppr cconv <+> ppr safety <+>
739 char '"' <> pprCEntity header lib spec <> char '"'
741 pprCEntity header lib (CLabel lbl) =
742 ptext SLIT("static") <+> ftext header <+> char '&' <>
743 pprLib lib <> ppr lbl
744 pprCEntity header lib (CFunction (StaticTarget lbl)) =
745 ptext SLIT("static") <+> ftext header <+> char '&' <>
746 pprLib lib <> ppr lbl
747 pprCEntity header lib (CFunction (DynamicTarget)) =
748 ptext SLIT("dynamic")
749 pprCEntity _ _ (CWrapper) = ptext SLIT("wrapper")
751 pprLib lib | nullFS lib = empty
752 | otherwise = char '[' <> ppr lib <> char ']'
754 instance Outputable ForeignExport where
755 ppr (CExport (CExportStatic lbl cconv)) =
756 ppr cconv <+> char '"' <> ppr lbl <> char '"'
758 ptext SLIT("dotnet") <+> ptext SLIT("\"<unused>\"")
760 instance Outputable FoType where
761 ppr DNType = ptext SLIT("type dotnet")
765 %************************************************************************
767 \subsection{Transformation rules}
769 %************************************************************************
772 type LRuleDecl name = Located (RuleDecl name)
775 = HsRule -- Source rule
776 RuleName -- Rule name
778 [RuleBndr name] -- Forall'd vars; after typechecking this includes tyvars
779 (Located (HsExpr name)) -- LHS
780 NameSet -- Free-vars from the LHS
781 (Located (HsExpr name)) -- RHS
782 NameSet -- Free-vars from the RHS
785 = RuleBndr (Located name)
786 | RuleBndrSig (Located name) (LHsType name)
788 collectRuleBndrSigTys :: [RuleBndr name] -> [LHsType name]
789 collectRuleBndrSigTys bndrs = [ty | RuleBndrSig _ ty <- bndrs]
791 instance OutputableBndr name => Outputable (RuleDecl name) where
792 ppr (HsRule name act ns lhs fv_lhs rhs fv_rhs)
793 = sep [text "{-# RULES" <+> doubleQuotes (ftext name) <+> ppr act,
794 nest 4 (pp_forall <+> pprExpr (unLoc lhs)),
795 nest 4 (equals <+> pprExpr (unLoc rhs) <+> text "#-}") ]
797 pp_forall | null ns = empty
798 | otherwise = text "forall" <+> fsep (map ppr ns) <> dot
800 instance OutputableBndr name => Outputable (RuleBndr name) where
801 ppr (RuleBndr name) = ppr name
802 ppr (RuleBndrSig name ty) = ppr name <> dcolon <> ppr ty
806 %************************************************************************
808 \subsection[DeprecDecl]{Deprecations}
810 %************************************************************************
812 We use exported entities for things to deprecate.
815 type LDeprecDecl name = Located (DeprecDecl name)
817 data DeprecDecl name = Deprecation name DeprecTxt
819 instance OutputableBndr name => Outputable (DeprecDecl name) where
820 ppr (Deprecation thing txt)
821 = hsep [text "{-# DEPRECATED", ppr thing, doubleQuotes (ppr txt), text "#-}"]