%
-% (c) The AQUA Project, Glasgow University, 1996
+% (c) The AQUA Project, Glasgow University, 1996-1998
%
\section[PprType]{Printing Types, TyVars, Classes, TyCons}
\begin{code}
-#include "HsVersions.h"
-
module PprType(
- GenTyVar, pprGenTyVar, pprTyVarBndr,
- TyCon, pprTyCon, showTyCon,
- GenType,
- pprGenType, pprParendGenType,
+ pprKind, pprParendKind,
pprType, pprParendType,
- pprMaybeTy,
- getTypeString,
- specMaybeTysSuffix,
+ pprConstraint, pprTheta,
+ pprTyVarBndr, pprTyVarBndrs,
+
getTyDescription,
- GenClass,
nmbrType, nmbrGlobalType
) where
-IMP_Ubiq()
-#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ <= 201
-IMPORT_DELOOPER(IdLoop)
-#else
-import {-# SOURCE #-} Id
-#endif
-
+#include "HsVersions.h"
-- friends:
-- (PprType can see all the representations it's trying to print)
-import Type ( GenType(..), maybeAppTyCon, Type(..), splitFunTy,
- splitForAllTy, splitSigmaTy, splitRhoTy, splitAppTys )
-import TyVar ( GenTyVar(..), TyVar(..), cloneTyVar )
-import TyCon ( TyCon(..), NewOrData )
-import Class ( SYN_IE(Class), GenClass(..) )
-import Kind ( Kind(..), isBoxedTypeKind, pprParendKind )
-import Usage ( pprUVar, GenUsage(..), SYN_IE(Usage), SYN_IE(UVar), cloneUVar )
+import Type ( GenType(..), TyNote(..), Kind, Type, ThetaType,
+ splitFunTys, splitDictTy_maybe,
+ splitForAllTys, splitSigmaTy, splitRhoTy,
+ boxedTypeKind
+ )
+import Var ( GenTyVar, TyVar, tyVarKind,
+ tyVarName, setTyVarName
+ )
+import VarEnv
+import TyCon ( TyCon, isTupleTyCon, isUnboxedTupleTyCon, tyConArity )
+import Class ( Class )
-- others:
-import CStrings ( identToC )
-import CmdLineOpts ( opt_OmitInterfacePragmas, opt_PprUserLength )
import Maybes ( maybeToBool )
-import Name ( nameString, Name{-instance Outputable-},
- OccName, pprOccName, getOccString, NamedThing(..)
- )
-import Outputable ( PprStyle(..), codeStyle, userStyle, ifaceStyle,
- ifPprShowAll, interpp'SP, Outputable(..)
- )
+import Name ( getOccString, setNameVisibility, NamedThing(..) )
+import Outputable
import PprEnv
-import Pretty
-import UniqFM ( UniqFM, addToUFM, emptyUFM, lookupUFM )
-import Unique ( Unique, Uniquable(..), pprUnique10, pprUnique,
+import Unique ( Unique, Uniquable(..),
incrUnique, listTyConKey, initTyVarUnique
)
import Util
\end{code}
+%************************************************************************
+%* *
+\subsection{The external interface}
+%* *
+%************************************************************************
+
+@pprType@ is the standard @Type@ printer; the overloaded @ppr@ function is
+defined to use this. @pprParendType@ is the same, except it puts
+parens around the type, except for the atomic cases. @pprParendType@
+works just by setting the initial context precedence very high.
+
\begin{code}
-instance (Eq tyvar, Outputable tyvar,
- Eq uvar, Outputable uvar ) => Outputable (GenType tyvar uvar) where
- ppr PprQuote ty = quotes (pprGenType (PprForUser opt_PprUserLength) ty)
- ppr sty ty = pprGenType sty ty
-
-instance Outputable TyCon where
- ppr sty tycon = pprTyCon sty tycon
-
-instance Outputable (GenClass tyvar uvar) where
- -- we use pprIfaceClass for printing in interfaces
- ppr sty (Class u n _ _ _ _ _ _ _) = ppr sty n
-
-instance Outputable (GenTyVar flexi) where
- ppr PprQuote ty = quotes (pprGenTyVar (PprForUser opt_PprUserLength) ty)
- ppr sty tv = pprGenTyVar sty tv
-
--- and two SPECIALIZEd ones:
-instance Outputable {-Type, i.e.:-}(GenType TyVar UVar) where
- ppr PprQuote ty = quotes (pprGenType (PprForUser opt_PprUserLength) ty)
- ppr other_sty ty = pprGenType other_sty ty
-
-instance Outputable {-TyVar, i.e.:-}(GenTyVar Usage) where
- ppr PprQuote ty = quotes (pprGenTyVar (PprForUser opt_PprUserLength) ty)
- ppr other_sty ty = pprGenTyVar other_sty ty
+pprType, pprParendType :: GenType flexi -> SDoc
+pprType ty = ppr_ty pprTyEnv tOP_PREC ty
+pprParendType ty = ppr_ty pprTyEnv tYCON_PREC ty
+
+pprKind, pprParendKind :: Kind -> SDoc
+pprKind = pprType
+pprParendKind = pprParendType
+
+pprConstraint :: Class -> [GenType flexi] -> SDoc
+pprConstraint clas tys = ppr clas <+> hsep (map (pprParendType) tys)
+
+pprTheta :: ThetaType -> SDoc
+pprTheta theta = parens (hsep (punctuate comma (map ppr_dict theta)))
+ where
+ ppr_dict (c,tys) = pprConstraint c tys
+
+instance Outputable (GenType flexi) where
+ ppr ty = pprType ty
\end{code}
+
%************************************************************************
%* *
-\subsection[Type]{@Type@}
+\subsection{Pretty printing}
%* *
%************************************************************************
| otherwise = parens pretty
\end{code}
-@pprGenType@ is the std @Type@ printer; the overloaded @ppr@ function is
-defined to use this. @pprParendGenType@ is the same, except it puts
-parens around the type, except for the atomic cases. @pprParendGenType@
-works just by setting the initial context precedence very high.
-
\begin{code}
-pprGenType, pprParendGenType :: (Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar)
- => PprStyle -> GenType tyvar uvar -> Doc
-
-pprGenType sty ty = ppr_ty (init_ppr_env sty) tOP_PREC ty
-pprParendGenType sty ty = ppr_ty (init_ppr_env sty) tYCON_PREC ty
-
-pprType, pprParendType :: PprStyle -> Type -> Doc
-pprType sty ty = ppr_ty (init_ppr_env_type sty) tOP_PREC ty
-pprParendType sty ty = ppr_ty (init_ppr_env_type sty) tYCON_PREC ty
-
-pprMaybeTy :: (Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar)
- => PprStyle -> Maybe (GenType tyvar uvar) -> Doc
-pprMaybeTy sty Nothing = char '*'
-pprMaybeTy sty (Just ty) = pprParendGenType sty ty
-\end{code}
-
-\begin{code}
-ppr_ty :: PprEnv tyvar uvar bndr occ -> Int
- -> GenType tyvar uvar
- -> Doc
+ppr_ty :: PprEnv (GenTyVar flexi) flexi -> Int
+ -> GenType flexi
+ -> SDoc
ppr_ty env ctxt_prec (TyVarTy tyvar)
= pTyVarO env tyvar
-ppr_ty env ctxt_prec (TyConTy tycon usage)
- = ppr_tycon env tycon
+ -- TUPLE CASE (boxed and unboxed)
+ppr_ty env ctxt_prec (TyConApp tycon tys)
+ | isTupleTyCon tycon
+ && length tys == tyConArity tycon -- no magic if partially applied
+ = parens tys_w_commas
-ppr_ty env ctxt_prec ty@(ForAllTy _ _)
- | show_forall = maybeParen ctxt_prec fUN_PREC $
- sep [ ptext SLIT("_forall_"), pp_tyvars,
- ppr_theta env theta, ptext SLIT("=>"), pp_body
- ]
- | null theta = ppr_ty env ctxt_prec body_ty
- | otherwise = maybeParen ctxt_prec fUN_PREC $
- sep [ppr_theta env theta, ptext SLIT("=>"), pp_body]
+ | isUnboxedTupleTyCon tycon
+ && length tys == tyConArity tycon -- no magic if partially applied
+ = parens (char '#' <+> tys_w_commas <+> char '#')
+ where
+ tys_w_commas = sep (punctuate comma (map (ppr_ty env tOP_PREC) tys))
+
+ -- LIST CASE
+ppr_ty env ctxt_prec (TyConApp tycon [ty])
+ | getUnique tycon == listTyConKey
+ = brackets (ppr_ty env tOP_PREC ty)
+
+ -- DICTIONARY CASE, prints {C a}
+ -- This means that instance decls come out looking right in interfaces
+ -- and that in turn means they get "gated" correctly when being slurped in
+ppr_ty env ctxt_prec ty@(TyConApp tycon tys)
+ | maybeToBool maybe_dict
+ = braces (ppr_dict env tYCON_PREC ctys)
where
- (tyvars, rho_ty) = splitForAllTy ty
- (theta, body_ty) | show_context = splitRhoTy rho_ty
- | otherwise = ([], rho_ty)
+ Just ctys = maybe_dict
+ maybe_dict = splitDictTy_maybe ty
+
+ -- NO-ARGUMENT CASE (=> no parens)
+ppr_ty env ctxt_prec (TyConApp tycon [])
+ = ppr tycon
+
+ -- GENERAL CASE
+ppr_ty env ctxt_prec (TyConApp tycon tys)
+ = maybeParen ctxt_prec tYCON_PREC (hsep [ppr tycon, tys_w_spaces])
+ where
+ tys_w_spaces = hsep (map (ppr_ty env tYCON_PREC) tys)
- pp_tyvars = brackets (hsep (map (pTyVarB env) tyvars))
+
+ppr_ty env ctxt_prec ty@(ForAllTy _ _)
+ = getPprStyle $ \ sty ->
+ maybeParen ctxt_prec fUN_PREC $
+ if userStyle sty then
+ sep [ ptext SLIT("forall"), pp_tyvars, ptext SLIT("."), pp_maybe_ctxt, pp_body ]
+ else
+ sep [ ptext SLIT("__forall"), brackets pp_tyvars, pp_ctxt, pp_body ]
+ where
+ (tyvars, rho_ty) = splitForAllTys ty
+ (theta, body_ty) = splitRhoTy rho_ty
+
+ pp_tyvars = hsep (map (pBndr env LambdaBind) tyvars)
pp_body = ppr_ty env tOP_PREC body_ty
+
+ pp_maybe_ctxt | null theta = empty
+ | otherwise = pp_ctxt
- sty = pStyle env
- show_forall = not (userStyle sty)
- show_context = ifaceStyle sty || userStyle sty
+ pp_ctxt = ppr_theta env theta <+> ptext SLIT("=>")
-ppr_ty env ctxt_prec (ForAllUsageTy uv uvs ty)
- = panic "ppr_ty:ForAllUsageTy"
-ppr_ty env ctxt_prec (FunTy ty1 ty2 usage)
+ppr_ty env ctxt_prec (FunTy ty1 ty2)
-- We fiddle the precedences passed to left/right branches,
-- so that right associativity comes out nicely...
= maybeParen ctxt_prec fUN_PREC (sep (ppr_ty env fUN_PREC ty1 : pp_rest))
where
- (arg_tys, result_ty) = splitFunTy ty2
+ (arg_tys, result_ty) = splitFunTys ty2
pp_rest = [ ptext SLIT("-> ") <> ppr_ty env fUN_PREC ty | ty <- arg_tys ++ [result_ty] ]
-ppr_ty env ctxt_prec ty@(AppTy _ _)
- = ppr_corner env ctxt_prec fun_ty arg_tys
- where
- (fun_ty, arg_tys) = splitAppTys ty
-
-ppr_ty env ctxt_prec (SynTy tycon tys expansion)
- | codeStyle (pStyle env)
- -- always expand types that squeak into C-variable names
- = ppr_ty env ctxt_prec expansion
-
- | otherwise
- = (<>)
- (ppr_app env ctxt_prec (ppr_tycon env tycon) tys)
- (ifPprShowAll (pStyle env) (hsep [text " {- expansion:",
- ppr_ty env tOP_PREC expansion,
- text "-}"]))
-
-ppr_ty env ctxt_prec (DictTy clas ty usage)
- = braces (ppr_dict env tOP_PREC (clas, ty))
- -- Curlies are temporary
-
-
--- Some help functions
-ppr_corner env ctxt_prec (TyConTy FunTyCon usage) arg_tys
- | length arg_tys == 2
- = ppr_ty env ctxt_prec (FunTy ty1 ty2 usage)
- where
- (ty1:ty2:_) = arg_tys
-
-ppr_corner env ctxt_prec (TyConTy (TupleTyCon _ _ arity) usage) arg_tys
- | not (codeStyle (pStyle env)) -- no magic in that case
- && length arg_tys == arity -- no magic if partially applied
- = parens arg_tys_w_commas
- where
- arg_tys_w_commas = hsep (punctuate comma (map (ppr_ty env tOP_PREC) arg_tys))
-
-ppr_corner env ctxt_prec (TyConTy tycon usage) arg_tys
- | not (codeStyle (pStyle env)) && uniqueOf tycon == listTyConKey
- = ASSERT(length arg_tys == 1)
- brackets (ppr_ty env tOP_PREC ty1)
- where
- (ty1:_) = arg_tys
+ppr_ty env ctxt_prec (AppTy ty1 ty2)
+ = maybeParen ctxt_prec tYCON_PREC $
+ ppr_ty env tOP_PREC ty1 <+> ppr_ty env tYCON_PREC ty2
-ppr_corner env ctxt_prec (TyConTy tycon usage) arg_tys
- = ppr_app env ctxt_prec (ppr_tycon env tycon) arg_tys
-
-ppr_corner env ctxt_prec (TyVarTy tyvar) arg_tys
- = ppr_app env ctxt_prec (pTyVarO env tyvar) arg_tys
-
-
-ppr_app env ctxt_prec pp_fun []
- = pp_fun
-ppr_app env ctxt_prec pp_fun arg_tys
- = maybeParen ctxt_prec tYCON_PREC (hsep [pp_fun, arg_tys_w_spaces])
- where
- arg_tys_w_spaces = hsep (map (ppr_ty env tYCON_PREC) arg_tys)
+ppr_ty env ctxt_prec (NoteTy (SynNote ty) expansion)
+ = ppr_ty env ctxt_prec ty
+ppr_ty env ctxt_prec (NoteTy (FTVNote _) ty) = ppr_ty env ctxt_prec ty
ppr_theta env [] = empty
ppr_theta env theta = braces (hsep (punctuate comma (map (ppr_dict env tOP_PREC) theta)))
-ppr_dict env ctxt_prec (clas, ty)
- = maybeParen ctxt_prec tYCON_PREC
- (hsep [ppr_class env clas, ppr_ty env tYCON_PREC ty])
+ppr_dict env ctxt (clas, tys) = ppr clas <+>
+ hsep (map (ppr_ty env tYCON_PREC) tys)
\end{code}
\begin{code}
- -- This one uses only "ppr"
-init_ppr_env sty
- = initPprEnv sty b b b b (Just (ppr sty)) (Just (ppr sty)) (Just (ppr sty)) b b b b b
- where
- b = panic "PprType:init_ppr_env"
-
- -- This one uses pprTyVarBndr, and thus is specific to GenTyVar's types
-init_ppr_env_type sty
- = initPprEnv sty b b b b (Just (pprTyVarBndr sty)) (Just (ppr sty)) (Just (ppr sty)) b b b b b
+pprTyEnv = initPprEnv b b (Just ppr) b (Just (\site -> pprTyVarBndr)) b
where
b = panic "PprType:init_ppr_env"
-
-ppr_tycon env tycon = ppr (pStyle env) tycon
-ppr_class env clas = ppr (pStyle env) clas
\end{code}
%************************************************************************
%* *
%************************************************************************
-\begin{code}
-pprGenTyVar sty (TyVar uniq kind maybe_name usage)
- = case maybe_name of
- -- If the tyvar has a name we can safely use just it, I think
- Just n -> pprOccName sty (getOccName n) <> debug_extra
- Nothing -> pp_kind <> pprUnique uniq
- where
- pp_kind = case kind of
- TypeKind -> char 'o'
- BoxedTypeKind -> char 't'
- UnboxedTypeKind -> char 'u'
- ArrowKind _ _ -> char 'a'
-
- debug_extra = case sty of
- PprDebug -> pp_debug
- PprShowAll -> pp_debug
- other -> empty
-
- pp_debug = text "_" <> pp_kind <> pprUnique uniq
-\end{code}
-
-We print type-variable binders with their kinds in interface files.
-
-\begin{code}
-pprTyVarBndr sty@PprInterface tyvar@(TyVar uniq kind name usage)
- | not (isBoxedTypeKind kind)
- = hcat [pprGenTyVar sty tyvar, text " :: ", pprParendKind kind]
- -- See comments with ppDcolon in PprCore.lhs
-
-pprTyVarBndr sty tyvar = pprGenTyVar sty tyvar
-\end{code}
-
-%************************************************************************
-%* *
-\subsection[TyCon]{@TyCon@}
-%* *
-%************************************************************************
-
-ToDo; all this is suspiciously like getOccName!
+We print type-variable binders with their kinds in interface files,
+and when in debug mode.
\begin{code}
-showTyCon :: PprStyle -> TyCon -> String
-showTyCon sty tycon = show (pprTyCon sty tycon)
+pprTyVarBndr tyvar
+ = getPprStyle $ \ sty ->
+ if (ifaceStyle sty || debugStyle sty) && kind /= boxedTypeKind then
+ hcat [ppr tyvar, text " :: ", pprParendKind kind]
+ -- See comments with ppDcolon in PprCore.lhs
+ else
+ ppr tyvar
+ where
+ kind = tyVarKind tyvar
-pprTyCon :: PprStyle -> TyCon -> Doc
-pprTyCon sty tycon = ppr sty (getName tycon)
+pprTyVarBndrs tyvars = hsep (map pprTyVarBndr tyvars)
\end{code}
-
%************************************************************************
%* *
\subsection{Mumbo jumbo}
%* *
%************************************************************************
-\begin{code}
- -- Shallowly magical; converts a type into something
- -- vaguely close to what can be used in C identifier.
- -- Produces things like what we have in mkCompoundName,
- -- which can be "dot"ted together...
-
-getTypeString :: Type -> FAST_STRING
-
-getTypeString ty
- = case (splitAppTys ty) of { (tc, args) ->
- _CONCAT_ (do_tc tc : map do_arg_ty args) }
- where
- do_tc (TyConTy tc _) = nameString (getName tc)
- do_tc (SynTy _ _ ty) = do_tc ty
- do_tc other = --pprTrace "getTypeString:do_tc:" (pprType PprDebug other) $
- (_PK_ (show (pprType PprForC other)))
-
- do_arg_ty (TyConTy tc _) = nameString (getName tc)
- do_arg_ty (TyVarTy tv) = _PK_ (show (ppr PprForC tv))
- do_arg_ty (SynTy _ _ ty) = do_arg_ty ty
- do_arg_ty other = --pprTrace "getTypeString:do_arg_ty:" (pprType PprDebug other) $
- _PK_ (show (pprType PprForC other))
-
- -- PprForC expands type synonyms as it goes;
- -- it also forces consistent naming of tycons
- -- (e.g., can't have both "(,) a b" and "(a,b)":
- -- must be consistent!
-
-specMaybeTysSuffix :: [Maybe Type] -> FAST_STRING
-specMaybeTysSuffix ty_maybes
- = panic "PprType.specMaybeTysSuffix"
-{- LATER:
- = let
- ty_strs = concat (map typeMaybeString ty_maybes)
- dotted_tys = [ _CONS_ '.' str | str <- ty_strs ]
- in
- _CONCAT_ dotted_tys
--}
-\end{code}
-
Grab a name for the type. This is used to determine the type
description for profiling.
+
\begin{code}
getTyDescription :: Type -> String
getTyDescription ty
= case (splitSigmaTy ty) of { (_, _, tau_ty) ->
case tau_ty of
- TyVarTy _ -> "*"
- AppTy fun _ -> getTyDescription fun
- FunTy _ res _ -> '-' : '>' : fun_result res
- TyConTy tycon _ -> getOccString tycon
- SynTy tycon _ _ -> getOccString tycon
- DictTy _ _ _ -> "dict"
- ForAllTy _ ty -> getTyDescription ty
- _ -> pprPanic "getTyDescription: other" (pprType PprDebug tau_ty)
+ TyVarTy _ -> "*"
+ AppTy fun _ -> getTyDescription fun
+ FunTy _ res -> '-' : '>' : fun_result res
+ TyConApp tycon _ -> getOccString tycon
+ NoteTy (FTVNote _) ty -> getTyDescription ty
+ NoteTy (SynNote ty1) _ -> getTyDescription ty1
+ ForAllTy _ ty -> getTyDescription ty
}
where
- fun_result (FunTy _ res _) = '>' : fun_result res
- fun_result other = getTyDescription other
+ fun_result (FunTy _ res) = '>' : fun_result res
+ fun_result other = getTyDescription other
\end{code}
-
%************************************************************************
%* *
\subsection{Renumbering types}
\begin{code}
nmbrGlobalType :: Type -> Type -- Renumber a top-level type
-nmbrGlobalType ty = nmbrType (\tyvar -> tyvar) (\uvar -> uvar) initTyVarUnique ty
+nmbrGlobalType ty = nmbrType emptyVarEnv initTyVarUnique ty
-nmbrType :: (TyVar -> TyVar) -> (UVar -> UVar) -- Mapping for free vars
- -> Unique
+nmbrType :: TyVarEnv Type -- Substitution
+ -> Unique -- This unique and its successors are not
+ -- free in the range of the substitution
-> Type
-> Type
-nmbrType tyvar_env uvar_env uniq ty
- = initNmbr tyvar_env uvar_env uniq (nmbrTy ty)
+nmbrType tyvar_env uniq ty
+ = initNmbr tyvar_env uniq (nmbrTy ty)
nmbrTy :: Type -> NmbrM Type
nmbrTy (TyVarTy tv)
- = lookupTyVar tv `thenNmbr` \ new_tv ->
- returnNmbr (TyVarTy new_tv)
+ = lookupTyVar tv
nmbrTy (AppTy t1 t2)
= nmbrTy t1 `thenNmbr` \ new_t1 ->
nmbrTy t2 `thenNmbr` \ new_t2 ->
returnNmbr (AppTy new_t1 new_t2)
-nmbrTy (TyConTy tc use)
- = nmbrUsage use `thenNmbr` \ new_use ->
- returnNmbr (TyConTy tc new_use)
+nmbrTy (TyConApp tc tys)
+ = mapNmbr nmbrTy tys `thenNmbr` \ new_tys ->
+ returnNmbr (TyConApp tc new_tys)
+
+nmbrTy (NoteTy (SynNote ty1) ty2)
+ = nmbrTy ty1 `thenNmbr` \ new_ty1 ->
+ nmbrTy ty2 `thenNmbr` \ new_ty2 ->
+ returnNmbr (NoteTy (SynNote new_ty1) new_ty2)
-nmbrTy (SynTy tc args expand)
- = mapNmbr nmbrTy args `thenNmbr` \ new_args ->
- nmbrTy expand `thenNmbr` \ new_expand ->
- returnNmbr (SynTy tc new_args new_expand)
+nmbrTy (NoteTy (FTVNote _) ty2) = nmbrTy ty2
nmbrTy (ForAllTy tv ty)
= addTyVar tv $ \ new_tv ->
nmbrTy ty `thenNmbr` \ new_ty ->
returnNmbr (ForAllTy new_tv new_ty)
-nmbrTy (ForAllUsageTy u us ty)
- = addUVar u $ \ new_u ->
- mapNmbr lookupUVar us `thenNmbr` \ new_us ->
- nmbrTy ty `thenNmbr` \ new_ty ->
- returnNmbr (ForAllUsageTy new_u new_us new_ty)
-
-nmbrTy (FunTy t1 t2 use)
+nmbrTy (FunTy t1 t2)
= nmbrTy t1 `thenNmbr` \ new_t1 ->
nmbrTy t2 `thenNmbr` \ new_t2 ->
- nmbrUsage use `thenNmbr` \ new_use ->
- returnNmbr (FunTy new_t1 new_t2 new_use)
-
-nmbrTy (DictTy c ty use)
- = nmbrTy ty `thenNmbr` \ new_ty ->
- nmbrUsage use `thenNmbr` \ new_use ->
- returnNmbr (DictTy c new_ty new_use)
-
-
-
-lookupTyVar tyvar (NmbrEnv tv_fn tv_env _ _) uniq
- = (uniq, tyvar')
- where
- tyvar' = case lookupUFM tv_env tyvar of
- Just tyvar' -> tyvar'
- Nothing -> tv_fn tyvar
-
-addTyVar tv m (NmbrEnv f_tv tv_ufm f_uv uv_ufm) u
- = m tv' nenv u'
- where
- nenv = NmbrEnv f_tv tv_ufm' f_uv uv_ufm
- tv_ufm' = addToUFM tv_ufm tv tv'
- tv' = cloneTyVar tv u
- u' = incrUnique u
-\end{code}
-
-Usage stuff
-
-\begin{code}
-nmbrUsage (UsageVar v)
- = lookupUVar v `thenNmbr` \ v' ->
- returnNmbr (UsageVar v)
-
-nmbrUsage u = returnNmbr u
+ returnNmbr (FunTy new_t1 new_t2)
-lookupUVar uvar (NmbrEnv _ _ uv_fn uv_env) uniq
- = (uniq, uvar')
+lookupTyVar tyvar env uniq
+ = (uniq, ty)
where
- uvar' = case lookupUFM uv_env uvar of
- Just uvar' -> uvar'
- Nothing -> uv_fn uvar
+ ty = case lookupVarEnv env tyvar of
+ Just ty -> ty
+ Nothing -> TyVarTy tyvar
-addUVar uv m (NmbrEnv f_tv tv_ufm f_uv uv_ufm) u
- = m uv' nenv u'
+addTyVar tv m env u
+ = m tv' env' u'
where
- nenv = NmbrEnv f_tv tv_ufm f_uv uv_ufm'
- uv_ufm' = addToUFM uv_ufm uv uv'
- uv' = cloneUVar uv u
- u' = incrUnique u
+ env' = extendVarEnv env tv (TyVarTy tv')
+ tv' = setTyVarName tv (setNameVisibility Nothing u (tyVarName tv))
+ u' = incrUnique u
\end{code}
Monad stuff
\begin{code}
-data NmbrEnv
- = NmbrEnv (TyVar -> TyVar) (UniqFM TyVar) -- Global and local map for tyvars
- (UVar -> UVar) (UniqFM UVar) -- ... for usage vars
+type NmbrM a = TyVarEnv Type -> Unique -> (Unique, a) -- Unique is name supply
-type NmbrM a = NmbrEnv -> Unique -> (Unique, a) -- Unique is name supply
-
-initNmbr :: (TyVar -> TyVar) -> (UVar -> UVar) -> Unique -> NmbrM a -> a
-initNmbr tyvar_env uvar_env uniq m
- = let
- init_nmbr_env = NmbrEnv tyvar_env emptyUFM uvar_env emptyUFM
- in
- snd (m init_nmbr_env uniq)
+initNmbr :: TyVarEnv Type -> Unique -> NmbrM a -> a
+initNmbr env uniq m
+ = snd (m env uniq)
returnNmbr x nenv u = (u, x)
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