import Name ( Name, nameUnique, NamedThing(getName) )
import PrelNames ( Unique, Uniquable(..), anyBoxConKey )
import PrimRep ( PrimRep(..), isFollowableRep )
-import Util ( lengthIs )
-import Maybes ( expectJust )
+import Maybes ( orElse )
import Outputable
import FastString
\end{code}
| NewTyCon Type -- Newtype, with its *ultimate* representation type
-- By 'ultimate' I mean that the rep type is not itself
-- a newtype or type synonym.
-
+ -- The rep type isn't entirely simple:
+ -- for a recursive newtype we pick () as the rep type
+ -- newtype T = MkT T
+ --
-- The rep type has free type variables the tyConTyVars
-- Thus:
-- newtype T a = MkT [(a,Int)]
-- The rep type is [(a,Int)]
- --
- -- The rep type isn't entirely simple:
- -- for a recursive newtype we pick () as the rep type
- -- newtype T = MkT T
+ -- NB: the rep type isn't necessarily the original RHS of the
+ -- newtype decl, because the rep type looks through other
+ -- newtypes. If you want hte original RHS, look at the
+ -- argument type of the data constructor.
data DataConDetails datacon
= DataCons [datacon] -- Its data constructors, with fully polymorphic types
\end{code}
\begin{code}
+isFunTyCon :: TyCon -> Bool
isFunTyCon (FunTyCon {}) = True
isFunTyCon _ = False
+isPrimTyCon :: TyCon -> Bool
isPrimTyCon (PrimTyCon {}) = True
isPrimTyCon _ = False
+isUnLiftedTyCon :: TyCon -> Bool
isUnLiftedTyCon (PrimTyCon {isUnLifted = is_unlifted}) = is_unlifted
isUnLiftedTyCon (TupleTyCon {tyConBoxed = boxity}) = not (isBoxed boxity)
isUnLiftedTyCon _ = False
-- isBoxedTyCon should not be applied to SynTyCon, nor KindCon
+isBoxedTyCon :: TyCon -> Bool
isBoxedTyCon (AlgTyCon {}) = True
isBoxedTyCon (FunTyCon {}) = True
isBoxedTyCon (TupleTyCon {tyConBoxed = boxity}) = isBoxed boxity
isBoxedTyCon (PrimTyCon {primTyConRep = rep}) = isFollowableRep rep
-- isAlgTyCon returns True for both @data@ and @newtype@
+isAlgTyCon :: TyCon -> Bool
isAlgTyCon (AlgTyCon {}) = True
isAlgTyCon (TupleTyCon {}) = True
isAlgTyCon other = False
+isDataTyCon :: TyCon -> Bool
-- isDataTyCon returns True for data types that are represented by
-- heap-allocated constructors.
-- These are srcutinised by Core-level @case@ expressions, and they
-- True for all @data@ types
-- False for newtypes
-- unboxed tuples
-isDataTyCon (AlgTyCon {algTyConFlavour = new_or_data, algTyConRec = is_rec})
+isDataTyCon (AlgTyCon {algTyConFlavour = new_or_data})
= case new_or_data of
NewTyCon _ -> False
other -> True
isDataTyCon (TupleTyCon {tyConBoxed = boxity}) = isBoxed boxity
isDataTyCon other = False
+isNewTyCon :: TyCon -> Bool
isNewTyCon (AlgTyCon {algTyConFlavour = NewTyCon _}) = True
isNewTyCon other = False
-newTyConRep :: TyCon -> ([TyVar], Type)
-newTyConRep (AlgTyCon {tyConTyVars = tvs, algTyConFlavour = NewTyCon rep}) = (tvs, rep)
-
+isProductTyCon :: TyCon -> Bool
-- A "product" tycon
-- has *one* constructor,
-- is *not* existential
isProductTyCon (TupleTyCon {}) = True
isProductTyCon other = False
+isSynTyCon :: TyCon -> Bool
isSynTyCon (SynTyCon {}) = True
isSynTyCon _ = False
+isEnumerationTyCon :: TyCon -> Bool
isEnumerationTyCon (AlgTyCon {algTyConFlavour = EnumTyCon}) = True
isEnumerationTyCon other = False
+isTupleTyCon :: TyCon -> Bool
-- The unit tycon didn't used to be classed as a tuple tycon
-- but I thought that was silly so I've undone it
-- If it can't be for some reason, it should be a AlgTyCon
isTupleTyCon (TupleTyCon {}) = True
isTupleTyCon other = False
+isUnboxedTupleTyCon :: TyCon -> Bool
isUnboxedTupleTyCon (TupleTyCon {tyConBoxed = boxity}) = not (isBoxed boxity)
isUnboxedTupleTyCon other = False
+isBoxedTupleTyCon :: TyCon -> Bool
isBoxedTupleTyCon (TupleTyCon {tyConBoxed = boxity}) = isBoxed boxity
isBoxedTupleTyCon other = False
tupleTyConBoxity tc = tyConBoxed tc
+isRecursiveTyCon :: TyCon -> Bool
isRecursiveTyCon (AlgTyCon {algTyConRec = Recursive}) = True
isRecursiveTyCon other = False
+isForeignTyCon :: TyCon -> Bool
-- isForeignTyCon identifies foreign-imported type constructors
-- For the moment, they are primitive but lifted, but that may change
isForeignTyCon (PrimTyCon {isUnLifted = is_unlifted}) = not is_unlifted
tyConDataConDetails other = Unknown
tyConDataCons :: TyCon -> [DataCon]
-tyConDataCons tycon = expectJust "tyConDataCons" (tyConDataCons_maybe tycon)
+-- It's convenient for tyConDataCons to return the
+-- empty list for type synonyms etc
+tyConDataCons tycon = tyConDataCons_maybe tycon `orElse` []
tyConDataCons_maybe :: TyCon -> Maybe [DataCon]
tyConDataCons_maybe (AlgTyCon {dataCons = DataCons cons}) = Just cons
\end{code}
\begin{code}
+newTyConRep :: TyCon -> ([TyVar], Type)
+newTyConRep (AlgTyCon {tyConTyVars = tvs, algTyConFlavour = NewTyCon rep}) = (tvs, rep)
+
tyConPrimRep :: TyCon -> PrimRep
tyConPrimRep (PrimTyCon {primTyConRep = rep}) = rep
tyConPrimRep tc = ASSERT( not (isUnboxedTupleTyCon tc) )