+-- -----------------------------------------------------------------------------
+-- Utils on IfaceSyn
+
+ifaceDeclSubBndrs :: IfaceDecl -> [OccName]
+-- *Excludes* the 'main' name, but *includes* the implicitly-bound names
+-- Deeply revolting, because it has to predict what gets bound,
+-- especially the question of whether there's a wrapper for a datacon
+
+-- N.B. the set of names returned here *must* match the set of
+-- TyThings returned by HscTypes.implicitTyThings, in the sense that
+-- TyThing.getOccName should define a bijection between the two lists.
+-- This invariant is used in LoadIface.loadDecl (see note [Tricky iface loop])
+-- The order of the list does not matter.
+ifaceDeclSubBndrs IfaceData {ifCons = IfAbstractTyCon} = []
+
+-- Newtype
+ifaceDeclSubBndrs (IfaceData {ifName = tc_occ,
+ ifCons = IfNewTyCon (
+ IfCon { ifConOcc = con_occ,
+ ifConFields = fields
+ }),
+ ifFamInst = famInst})
+ = -- fields (names of selectors)
+ fields ++
+ -- implicit coerion and (possibly) family instance coercion
+ (mkNewTyCoOcc tc_occ) : (famInstCo famInst tc_occ) ++
+ -- data constructor and worker (newtypes don't have a wrapper)
+ [con_occ, mkDataConWorkerOcc con_occ]
+
+
+ifaceDeclSubBndrs (IfaceData {ifName = tc_occ,
+ ifCons = IfDataTyCon cons,
+ ifFamInst = famInst})
+ = -- fields (names of selectors)
+ nub (concatMap ifConFields cons) -- Eliminate duplicate fields
+ -- (possibly) family instance coercion;
+ -- there is no implicit coercion for non-newtypes
+ ++ famInstCo famInst tc_occ
+ -- for each data constructor in order,
+ -- data constructor, worker, and (possibly) wrapper
+ ++ concatMap dc_occs cons
+ where
+ dc_occs con_decl
+ | has_wrapper = [con_occ, work_occ, wrap_occ]
+ | otherwise = [con_occ, work_occ]
+ where
+ con_occ = ifConOcc con_decl -- DataCon namespace
+ wrap_occ = mkDataConWrapperOcc con_occ -- Id namespace
+ work_occ = mkDataConWorkerOcc con_occ -- Id namespace
+ strs = ifConStricts con_decl
+ has_wrapper = any isMarkedStrict strs -- See MkId.mkDataConIds (sigh)
+ || not (null . ifConEqSpec $ con_decl)
+ || isJust famInst
+ -- ToDo: may miss strictness in existential dicts
+
+ifaceDeclSubBndrs (IfaceClass {ifCtxt = sc_ctxt, ifName = cls_occ,
+ ifSigs = sigs, ifATs = ats })
+ = -- dictionary datatype:
+ -- type constructor
+ tc_occ :
+ -- (possibly) newtype coercion
+ co_occs ++
+ -- data constructor (DataCon namespace)
+ -- data worker (Id namespace)
+ -- no wrapper (class dictionaries never have a wrapper)
+ [dc_occ, dcww_occ] ++
+ -- associated types
+ [ifName at | at <- ats ] ++
+ -- superclass selectors
+ [mkSuperDictSelOcc n cls_occ | n <- [1..n_ctxt]] ++
+ -- operation selectors
+ [op | IfaceClassOp op _ _ <- sigs]
+ where
+ n_ctxt = length sc_ctxt
+ n_sigs = length sigs
+ tc_occ = mkClassTyConOcc cls_occ
+ dc_occ = mkClassDataConOcc cls_occ
+ co_occs | is_newtype = [mkNewTyCoOcc tc_occ]
+ | otherwise = []
+ dcww_occ = mkDataConWorkerOcc dc_occ
+ is_newtype = n_sigs + n_ctxt == 1 -- Sigh
+
+ifaceDeclSubBndrs (IfaceSyn {ifName = tc_occ,
+ ifFamInst = famInst})
+ = famInstCo famInst tc_occ
+
+ifaceDeclSubBndrs _ = []
+
+-- coercion for data/newtype family instances
+famInstCo :: Maybe (IfaceTyCon, [IfaceType]) -> OccName -> [OccName]
+famInstCo Nothing _ = []
+famInstCo (Just _) baseOcc = [mkInstTyCoOcc baseOcc]
+
+----------------------------- Printing IfaceDecl ------------------------------
+