{-
(c) The University of Glasgow 2006
(c) The GRASP/AQUA Project, Glasgow University, 1992-1999
-}

{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE TypeFamilies #-}

module TcTypeable(mkTypeableBinds) where


import GhcPrelude

import BasicTypes ( Boxity(..), neverInlinePragma, SourceText(..) )
import TcBinds( addTypecheckedBinds )
import IfaceEnv( newGlobalBinder )
import TyCoRep( Type(..), TyLit(..) )
import TcEnv
import TcEvidence ( mkWpTyApps )
import TcRnMonad
import TcTypeableValidity
import HscTypes ( lookupId )
import PrelNames
import TysPrim ( primTyCons )
import TysWiredIn ( tupleTyCon, sumTyCon, runtimeRepTyCon
                  , vecCountTyCon, vecElemTyCon
                  , nilDataCon, consDataCon )
import Name
import Id
import Type
import TyCon
import DataCon
import Module
import HsSyn
import DynFlags
import Bag
import Var ( VarBndr(..) )
import CoreMap
import Constants
import Fingerprint(Fingerprint(..), fingerprintString, fingerprintFingerprints)
import Outputable
import FastString ( FastString, mkFastString, fsLit )

import Control.Monad.Trans.State
import Control.Monad.Trans.Class (lift)
import Data.Word( Word64 )

{- Note [Grand plan for Typeable]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The overall plan is this:

1. Generate a binding for each module p:M
   (done in TcTypeable by mkModIdBindings)
       M.$trModule :: GHC.Types.Module
       M.$trModule = Module "p" "M"
   ("tr" is short for "type representation"; see GHC.Types)

   We might want to add the filename too.
   This can be used for the lightweight stack-tracing stuff too

   Record the Name M.$trModule in the tcg_tr_module field of TcGblEnv

2. Generate a binding for every data type declaration T in module M,
       M.$tcT :: GHC.Types.TyCon
       M.$tcT = TyCon ...fingerprint info...
                      $trModule
                      "T"
                      0#
                      kind_rep

   Here 0# is the number of arguments expected by the tycon to fully determine
   its kind. kind_rep is a value of type GHC.Types.KindRep, which gives a
   recipe for computing the kind of an instantiation of the tycon (see
   Note [Representing TyCon kinds: KindRep] later in this file for details).

   We define (in TyCon)

        type TyConRepName = Name

   to use for these M.$tcT "tycon rep names". Note that these must be
   treated as "never exported" names by Backpack (see
   Note [Handling never-exported TyThings under Backpack]). Consequently
   they get slightly special treatment in RnModIface.rnIfaceDecl.

3. Record the TyConRepName in T's TyCon, including for promoted
   data and type constructors, and kinds like * and #.

   The TyConRepName is not an "implicit Id".  It's more like a record
   selector: the TyCon knows its name but you have to go to the
   interface file to find its type, value, etc

4. Solve Typeable constraints.  This is done by a custom Typeable solver,
   currently in TcInteract, that use M.$tcT so solve (Typeable T).

There are many wrinkles:

* The timing of when we produce this bindings is rather important: they must be
  defined after the rest of the module has been typechecked since we need to be
  able to lookup Module and TyCon in the type environment and we may be
  currently compiling GHC.Types (where they are defined).

* GHC.Prim doesn't have any associated object code, so we need to put the
  representations for types defined in this module elsewhere. We chose this
  place to be GHC.Types. TcTypeable.mkPrimTypeableBinds is responsible for
  injecting the bindings for the GHC.Prim representions when compiling
  GHC.Types.

* TyCon.tyConRepModOcc is responsible for determining where to find
  the representation binding for a given type. This is where we handle
  the special case for GHC.Prim.

* To save space and reduce dependencies, we need use quite low-level
  representations for TyCon and Module.  See GHC.Types
  Note [Runtime representation of modules and tycons]

* The KindReps can unfortunately get quite large. Moreover, the simplifier will
  float out various pieces of them, resulting in numerous top-level bindings.
  Consequently we mark the KindRep bindings as noinline, ensuring that the
  float-outs don't make it into the interface file. This is important since
  there is generally little benefit to inlining KindReps and they would
  otherwise strongly affect compiler performance.

* In general there are lots of things of kind *, * -> *, and * -> * -> *. To
  reduce the number of bindings we need to produce, we generate their KindReps
  once in GHC.Types. These are referred to as "built-in" KindReps below.

* Even though KindReps aren't inlined, this scheme still has more of an effect on
  compilation time than I'd like. This is especially true in the case of
  families of type constructors (e.g. tuples and unboxed sums). The problem is
  particularly bad in the case of sums, since each arity-N tycon brings with it
  N promoted datacons, each with a KindRep whose size also scales with N.
  Consequently we currently simply don't allow sums to be Typeable.

  In general we might consider moving some or all of this generation logic back
  to the solver since the performance hit we take in doing this at
  type-definition time is non-trivial and Typeable isn't very widely used. This
  is discussed in #13261.

-}

-- | Generate the Typeable bindings for a module. This is the only
-- entry-point of this module and is invoked by the typechecker driver in
-- 'tcRnSrcDecls'.
--
-- See Note [Grand plan for Typeable] in TcTypeable.
mkTypeableBinds :: TcM TcGblEnv
mkTypeableBinds :: TcM TcGblEnv
mkTypeableBinds
  = do { -- Create a binding for $trModule.
         -- Do this before processing any data type declarations,
         -- which need tcg_tr_module to be initialised
       ; TcGblEnv
tcg_env <- TcM TcGblEnv
mkModIdBindings
         -- Now we can generate the TyCon representations...
         -- First we handle the primitive TyCons if we are compiling GHC.Types
       ; (tcg_env :: TcGblEnv
tcg_env, prim_todos :: [TypeRepTodo]
prim_todos) <- TcGblEnv
-> TcRnIf TcGblEnv TcLclEnv (TcGblEnv, [TypeRepTodo])
-> TcRnIf TcGblEnv TcLclEnv (TcGblEnv, [TypeRepTodo])
forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv TcGblEnv
tcg_env TcRnIf TcGblEnv TcLclEnv (TcGblEnv, [TypeRepTodo])
mkPrimTypeableTodos

         -- Then we produce bindings for the user-defined types in this module.
       ; TcGblEnv -> TcM TcGblEnv -> TcM TcGblEnv
forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv TcGblEnv
tcg_env (TcM TcGblEnv -> TcM TcGblEnv) -> TcM TcGblEnv -> TcM TcGblEnv
forall a b. (a -> b) -> a -> b
$
    do { Module
mod <- IOEnv (Env TcGblEnv TcLclEnv) Module
forall (m :: * -> *). HasModule m => m Module
getModule
       ; let tycons :: [TyCon]
tycons = (TyCon -> Bool) -> [TyCon] -> [TyCon]
forall a. (a -> Bool) -> [a] -> [a]
filter TyCon -> Bool
needs_typeable_binds (TcGblEnv -> [TyCon]
tcg_tcs TcGblEnv
tcg_env)
             mod_id :: Id
mod_id = case TcGblEnv -> Maybe Id
tcg_tr_module TcGblEnv
tcg_env of  -- Should be set by now
                        Just mod_id :: Id
mod_id -> Id
mod_id
                        Nothing     -> String -> SDoc -> Id
forall a. HasCallStack => String -> SDoc -> a
pprPanic "tcMkTypeableBinds" ([TyCon] -> SDoc
forall a. Outputable a => a -> SDoc
ppr [TyCon]
tycons)
       ; String -> SDoc -> TcRn ()
traceTc "mkTypeableBinds" ([TyCon] -> SDoc
forall a. Outputable a => a -> SDoc
ppr [TyCon]
tycons)
       ; TypeRepTodo
this_mod_todos <- Module -> Id -> [TyCon] -> TcM TypeRepTodo
todoForTyCons Module
mod Id
mod_id [TyCon]
tycons
       ; [TypeRepTodo] -> TcM TcGblEnv
mkTypeRepTodoBinds (TypeRepTodo
this_mod_todos TypeRepTodo -> [TypeRepTodo] -> [TypeRepTodo]
forall a. a -> [a] -> [a]
: [TypeRepTodo]
prim_todos)
       } }
  where
    needs_typeable_binds :: TyCon -> Bool
needs_typeable_binds tc :: TyCon
tc
      | TyCon
tc TyCon -> [TyCon] -> Bool
forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`elem` [TyCon
runtimeRepTyCon, TyCon
vecCountTyCon, TyCon
vecElemTyCon]
      = Bool
False
      | Bool
otherwise =
          TyCon -> Bool
isAlgTyCon TyCon
tc
       Bool -> Bool -> Bool
|| TyCon -> Bool
isDataFamilyTyCon TyCon
tc
       Bool -> Bool -> Bool
|| TyCon -> Bool
isClassTyCon TyCon
tc


{- *********************************************************************
*                                                                      *
            Building top-level binding for $trModule
*                                                                      *
********************************************************************* -}

mkModIdBindings :: TcM TcGblEnv
mkModIdBindings :: TcM TcGblEnv
mkModIdBindings
  = do { Module
mod <- IOEnv (Env TcGblEnv TcLclEnv) Module
forall (m :: * -> *). HasModule m => m Module
getModule
       ; SrcSpan
loc <- TcRn SrcSpan
getSrcSpanM
       ; Name
mod_nm        <- Module -> OccName -> SrcSpan -> TcRnIf TcGblEnv TcLclEnv Name
forall a b. Module -> OccName -> SrcSpan -> TcRnIf a b Name
newGlobalBinder Module
mod (String -> OccName
mkVarOcc "$trModule") SrcSpan
loc
       ; TyCon
trModuleTyCon <- Name -> TcM TyCon
tcLookupTyCon Name
trModuleTyConName
       ; let mod_id :: Id
mod_id = Name -> Type -> Id
mkExportedVanillaId Name
mod_nm (TyCon -> [Type] -> Type
mkTyConApp TyCon
trModuleTyCon [])
       ; LHsBind (GhcPass 'Typechecked)
mod_bind      <- IdP (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsBind (GhcPass 'Typechecked)
forall (p :: Pass).
IdP (GhcPass p) -> LHsExpr (GhcPass p) -> LHsBind (GhcPass p)
mkVarBind Id
IdP (GhcPass 'Typechecked)
mod_id (LHsExpr (GhcPass 'Typechecked) -> LHsBind (GhcPass 'Typechecked))
-> IOEnv (Env TcGblEnv TcLclEnv) (LHsExpr (GhcPass 'Typechecked))
-> IOEnv (Env TcGblEnv TcLclEnv) (LHsBind (GhcPass 'Typechecked))
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Module
-> IOEnv (Env TcGblEnv TcLclEnv) (LHsExpr (GhcPass 'Typechecked))
mkModIdRHS Module
mod

       ; TcGblEnv
tcg_env <- [Id] -> TcM TcGblEnv -> TcM TcGblEnv
forall a. [Id] -> TcM a -> TcM a
tcExtendGlobalValEnv [Id
mod_id] TcM TcGblEnv
forall gbl lcl. TcRnIf gbl lcl gbl
getGblEnv
       ; TcGblEnv -> TcM TcGblEnv
forall (m :: * -> *) a. Monad m => a -> m a
return (TcGblEnv
tcg_env { tcg_tr_module :: Maybe Id
tcg_tr_module = Id -> Maybe Id
forall a. a -> Maybe a
Just Id
mod_id }
                 TcGblEnv -> [LHsBinds (GhcPass 'Typechecked)] -> TcGblEnv
`addTypecheckedBinds` [LHsBind (GhcPass 'Typechecked) -> LHsBinds (GhcPass 'Typechecked)
forall a. a -> Bag a
unitBag LHsBind (GhcPass 'Typechecked)
mod_bind]) }

mkModIdRHS :: Module -> TcM (LHsExpr GhcTc)
mkModIdRHS :: Module
-> IOEnv (Env TcGblEnv TcLclEnv) (LHsExpr (GhcPass 'Typechecked))
mkModIdRHS mod :: Module
mod
  = do { DataCon
trModuleDataCon <- Name -> TcM DataCon
tcLookupDataCon Name
trModuleDataConName
       ; FastString -> LHsExpr (GhcPass 'Typechecked)
trNameLit <- TcM (FastString -> LHsExpr (GhcPass 'Typechecked))
mkTrNameLit
       ; LHsExpr (GhcPass 'Typechecked)
-> IOEnv (Env TcGblEnv TcLclEnv) (LHsExpr (GhcPass 'Typechecked))
forall (m :: * -> *) a. Monad m => a -> m a
return (LHsExpr (GhcPass 'Typechecked)
 -> IOEnv (Env TcGblEnv TcLclEnv) (LHsExpr (GhcPass 'Typechecked)))
-> LHsExpr (GhcPass 'Typechecked)
-> IOEnv (Env TcGblEnv TcLclEnv) (LHsExpr (GhcPass 'Typechecked))
forall a b. (a -> b) -> a -> b
$ DataCon -> LHsExpr (GhcPass 'Typechecked)
nlHsDataCon DataCon
trModuleDataCon
                  LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` FastString -> LHsExpr (GhcPass 'Typechecked)
trNameLit (UnitId -> FastString
unitIdFS (Module -> UnitId
moduleUnitId Module
mod))
                  LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` FastString -> LHsExpr (GhcPass 'Typechecked)
trNameLit (ModuleName -> FastString
moduleNameFS (Module -> ModuleName
moduleName Module
mod))
       }

{- *********************************************************************
*                                                                      *
                Building type-representation bindings
*                                                                      *
********************************************************************* -}

-- | Information we need about a 'TyCon' to generate its representation. We
-- carry the 'Id' in order to share it between the generation of the @TyCon@ and
-- @KindRep@ bindings.
data TypeableTyCon
    = TypeableTyCon
      { TypeableTyCon -> TyCon
tycon        :: !TyCon
      , TypeableTyCon -> Id
tycon_rep_id :: !Id
      }

-- | A group of 'TyCon's in need of type-rep bindings.
data TypeRepTodo
    = TypeRepTodo
      { TypeRepTodo -> LHsExpr (GhcPass 'Typechecked)
mod_rep_expr    :: LHsExpr GhcTc    -- ^ Module's typerep binding
      , TypeRepTodo -> Fingerprint
pkg_fingerprint :: !Fingerprint     -- ^ Package name fingerprint
      , TypeRepTodo -> Fingerprint
mod_fingerprint :: !Fingerprint     -- ^ Module name fingerprint
      , TypeRepTodo -> [TypeableTyCon]
todo_tycons     :: [TypeableTyCon]
        -- ^ The 'TyCon's in need of bindings kinds
      }
    | ExportedKindRepsTodo [(Kind, Id)]
      -- ^ Build exported 'KindRep' bindings for the given set of kinds.

todoForTyCons :: Module -> Id -> [TyCon] -> TcM TypeRepTodo
todoForTyCons :: Module -> Id -> [TyCon] -> TcM TypeRepTodo
todoForTyCons mod :: Module
mod mod_id :: Id
mod_id tycons :: [TyCon]
tycons = do
    Type
trTyConTy <- TyCon -> Type
mkTyConTy (TyCon -> Type) -> TcM TyCon -> IOEnv (Env TcGblEnv TcLclEnv) Type
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Name -> TcM TyCon
tcLookupTyCon Name
trTyConTyConName
    let mk_rep_id :: TyConRepName -> Id
        mk_rep_id :: Name -> Id
mk_rep_id rep_name :: Name
rep_name = Name -> Type -> Id
mkExportedVanillaId Name
rep_name Type
trTyConTy

    let typeable_tycons :: [TypeableTyCon]
        typeable_tycons :: [TypeableTyCon]
typeable_tycons =
            [ $WTypeableTyCon :: TyCon -> Id -> TypeableTyCon
TypeableTyCon { tycon :: TyCon
tycon = TyCon
tc''
                            , tycon_rep_id :: Id
tycon_rep_id = Name -> Id
mk_rep_id Name
rep_name
                            }
            | TyCon
tc     <- [TyCon]
tycons
            , TyCon
tc'    <- TyCon
tc TyCon -> [TyCon] -> [TyCon]
forall a. a -> [a] -> [a]
: TyCon -> [TyCon]
tyConATs TyCon
tc
              -- We need type representations for any associated types
            , let promoted :: [TyCon]
promoted = (DataCon -> TyCon) -> [DataCon] -> [TyCon]
forall a b. (a -> b) -> [a] -> [b]
map DataCon -> TyCon
promoteDataCon (TyCon -> [DataCon]
tyConDataCons TyCon
tc')
            , TyCon
tc''   <- TyCon
tc' TyCon -> [TyCon] -> [TyCon]
forall a. a -> [a] -> [a]
: [TyCon]
promoted
              -- Don't make bindings for data-family instance tycons.
              -- Do, however, make them for their promoted datacon (see #13915).
            , Bool -> Bool
not (Bool -> Bool) -> Bool -> Bool
forall a b. (a -> b) -> a -> b
$ TyCon -> Bool
isFamInstTyCon TyCon
tc''
            , Just rep_name :: Name
rep_name <- Maybe Name -> [Maybe Name]
forall (f :: * -> *) a. Applicative f => a -> f a
pure (Maybe Name -> [Maybe Name]) -> Maybe Name -> [Maybe Name]
forall a b. (a -> b) -> a -> b
$ TyCon -> Maybe Name
tyConRepName_maybe TyCon
tc''
            , Type -> Bool
typeIsTypeable (Type -> Bool) -> Type -> Bool
forall a b. (a -> b) -> a -> b
$ Type -> Type
dropForAlls (Type -> Type) -> Type -> Type
forall a b. (a -> b) -> a -> b
$ TyCon -> Type
tyConKind TyCon
tc''
            ]
    TypeRepTodo -> TcM TypeRepTodo
forall (m :: * -> *) a. Monad m => a -> m a
return $WTypeRepTodo :: LHsExpr (GhcPass 'Typechecked)
-> Fingerprint -> Fingerprint -> [TypeableTyCon] -> TypeRepTodo
TypeRepTodo { mod_rep_expr :: LHsExpr (GhcPass 'Typechecked)
mod_rep_expr    = IdP (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass). IdP (GhcPass id) -> LHsExpr (GhcPass id)
nlHsVar Id
IdP (GhcPass 'Typechecked)
mod_id
                       , pkg_fingerprint :: Fingerprint
pkg_fingerprint = Fingerprint
pkg_fpr
                       , mod_fingerprint :: Fingerprint
mod_fingerprint = Fingerprint
mod_fpr
                       , todo_tycons :: [TypeableTyCon]
todo_tycons     = [TypeableTyCon]
typeable_tycons
                       }
  where
    mod_fpr :: Fingerprint
mod_fpr = String -> Fingerprint
fingerprintString (String -> Fingerprint) -> String -> Fingerprint
forall a b. (a -> b) -> a -> b
$ ModuleName -> String
moduleNameString (ModuleName -> String) -> ModuleName -> String
forall a b. (a -> b) -> a -> b
$ Module -> ModuleName
moduleName Module
mod
    pkg_fpr :: Fingerprint
pkg_fpr = String -> Fingerprint
fingerprintString (String -> Fingerprint) -> String -> Fingerprint
forall a b. (a -> b) -> a -> b
$ UnitId -> String
unitIdString (UnitId -> String) -> UnitId -> String
forall a b. (a -> b) -> a -> b
$ Module -> UnitId
moduleUnitId Module
mod

todoForExportedKindReps :: [(Kind, Name)] -> TcM TypeRepTodo
todoForExportedKindReps :: [(Type, Name)] -> TcM TypeRepTodo
todoForExportedKindReps kinds :: [(Type, Name)]
kinds = do
    Type
trKindRepTy <- TyCon -> Type
mkTyConTy (TyCon -> Type) -> TcM TyCon -> IOEnv (Env TcGblEnv TcLclEnv) Type
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Name -> TcM TyCon
tcLookupTyCon Name
kindRepTyConName
    let mkId :: (Type, Name) -> (Type, Id)
mkId (k :: Type
k, name :: Name
name) = (Type
k, Name -> Type -> Id
mkExportedVanillaId Name
name Type
trKindRepTy)
    TypeRepTodo -> TcM TypeRepTodo
forall (m :: * -> *) a. Monad m => a -> m a
return (TypeRepTodo -> TcM TypeRepTodo) -> TypeRepTodo -> TcM TypeRepTodo
forall a b. (a -> b) -> a -> b
$ [(Type, Id)] -> TypeRepTodo
ExportedKindRepsTodo ([(Type, Id)] -> TypeRepTodo) -> [(Type, Id)] -> TypeRepTodo
forall a b. (a -> b) -> a -> b
$ ((Type, Name) -> (Type, Id)) -> [(Type, Name)] -> [(Type, Id)]
forall a b. (a -> b) -> [a] -> [b]
map (Type, Name) -> (Type, Id)
mkId [(Type, Name)]
kinds

-- | Generate TyCon bindings for a set of type constructors
mkTypeRepTodoBinds :: [TypeRepTodo] -> TcM TcGblEnv
mkTypeRepTodoBinds :: [TypeRepTodo] -> TcM TcGblEnv
mkTypeRepTodoBinds [] = TcM TcGblEnv
forall gbl lcl. TcRnIf gbl lcl gbl
getGblEnv
mkTypeRepTodoBinds todos :: [TypeRepTodo]
todos
  = do { TypeableStuff
stuff <- TcM TypeableStuff
collect_stuff

         -- First extend the type environment with all of the bindings
         -- which we are going to produce since we may need to refer to them
         -- while generating kind representations (namely, when we want to
         -- represent a TyConApp in a kind, we must be able to look up the
         -- TyCon associated with the applied type constructor).
       ; let produced_bndrs :: [Id]
             produced_bndrs :: [Id]
produced_bndrs = [ Id
tycon_rep_id
                              | todo :: TypeRepTodo
todo@(TypeRepTodo{}) <- [TypeRepTodo]
todos
                              , TypeableTyCon {..} <- TypeRepTodo -> [TypeableTyCon]
todo_tycons TypeRepTodo
todo
                              ] [Id] -> [Id] -> [Id]
forall a. [a] -> [a] -> [a]
++
                              [ Id
rep_id
                              | ExportedKindRepsTodo kinds :: [(Type, Id)]
kinds <- [TypeRepTodo]
todos
                              , (_, rep_id :: Id
rep_id) <- [(Type, Id)]
kinds
                              ]
       ; TcGblEnv
gbl_env <- [Id] -> TcM TcGblEnv -> TcM TcGblEnv
forall a. [Id] -> TcM a -> TcM a
tcExtendGlobalValEnv [Id]
produced_bndrs TcM TcGblEnv
forall gbl lcl. TcRnIf gbl lcl gbl
getGblEnv

       ; let mk_binds :: TypeRepTodo -> KindRepM [LHsBinds GhcTc]
             mk_binds :: TypeRepTodo -> KindRepM [LHsBinds (GhcPass 'Typechecked)]
mk_binds todo :: TypeRepTodo
todo@(TypeRepTodo {}) =
                 (TypeableTyCon -> KindRepM (LHsBinds (GhcPass 'Typechecked)))
-> [TypeableTyCon] -> KindRepM [LHsBinds (GhcPass 'Typechecked)]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM (TypeableStuff
-> TypeRepTodo
-> TypeableTyCon
-> KindRepM (LHsBinds (GhcPass 'Typechecked))
mkTyConRepBinds TypeableStuff
stuff TypeRepTodo
todo) (TypeRepTodo -> [TypeableTyCon]
todo_tycons TypeRepTodo
todo)
             mk_binds (ExportedKindRepsTodo kinds :: [(Type, Id)]
kinds) =
                 TypeableStuff -> [(Type, Id)] -> KindRepM ()
mkExportedKindReps TypeableStuff
stuff [(Type, Id)]
kinds KindRepM ()
-> KindRepM [LHsBinds (GhcPass 'Typechecked)]
-> KindRepM [LHsBinds (GhcPass 'Typechecked)]
forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> [LHsBinds (GhcPass 'Typechecked)]
-> KindRepM [LHsBinds (GhcPass 'Typechecked)]
forall (m :: * -> *) a. Monad m => a -> m a
return []

       ; (gbl_env :: TcGblEnv
gbl_env, binds :: [[LHsBinds (GhcPass 'Typechecked)]]
binds) <- TcGblEnv
-> TcRnIf
     TcGblEnv TcLclEnv (TcGblEnv, [[LHsBinds (GhcPass 'Typechecked)]])
-> TcRnIf
     TcGblEnv TcLclEnv (TcGblEnv, [[LHsBinds (GhcPass 'Typechecked)]])
forall gbl lcl a. gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv TcGblEnv
gbl_env
                             (TcRnIf
   TcGblEnv TcLclEnv (TcGblEnv, [[LHsBinds (GhcPass 'Typechecked)]])
 -> TcRnIf
      TcGblEnv TcLclEnv (TcGblEnv, [[LHsBinds (GhcPass 'Typechecked)]]))
-> TcRnIf
     TcGblEnv TcLclEnv (TcGblEnv, [[LHsBinds (GhcPass 'Typechecked)]])
-> TcRnIf
     TcGblEnv TcLclEnv (TcGblEnv, [[LHsBinds (GhcPass 'Typechecked)]])
forall a b. (a -> b) -> a -> b
$ KindRepM [[LHsBinds (GhcPass 'Typechecked)]]
-> TcRnIf
     TcGblEnv TcLclEnv (TcGblEnv, [[LHsBinds (GhcPass 'Typechecked)]])
forall a. KindRepM a -> TcRn (TcGblEnv, a)
runKindRepM ((TypeRepTodo -> KindRepM [LHsBinds (GhcPass 'Typechecked)])
-> [TypeRepTodo] -> KindRepM [[LHsBinds (GhcPass 'Typechecked)]]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM TypeRepTodo -> KindRepM [LHsBinds (GhcPass 'Typechecked)]
mk_binds [TypeRepTodo]
todos)
       ; TcGblEnv -> TcM TcGblEnv
forall (m :: * -> *) a. Monad m => a -> m a
return (TcGblEnv -> TcM TcGblEnv) -> TcGblEnv -> TcM TcGblEnv
forall a b. (a -> b) -> a -> b
$ TcGblEnv
gbl_env TcGblEnv -> [LHsBinds (GhcPass 'Typechecked)] -> TcGblEnv
`addTypecheckedBinds` [[LHsBinds (GhcPass 'Typechecked)]]
-> [LHsBinds (GhcPass 'Typechecked)]
forall (t :: * -> *) a. Foldable t => t [a] -> [a]
concat [[LHsBinds (GhcPass 'Typechecked)]]
binds }

-- | Generate bindings for the type representation of a wired-in 'TyCon's
-- defined by the virtual "GHC.Prim" module. This is where we inject the
-- representation bindings for these primitive types into "GHC.Types"
--
-- See Note [Grand plan for Typeable] in this module.
mkPrimTypeableTodos :: TcM (TcGblEnv, [TypeRepTodo])
mkPrimTypeableTodos :: TcRnIf TcGblEnv TcLclEnv (TcGblEnv, [TypeRepTodo])
mkPrimTypeableTodos
  = do { Module
mod <- IOEnv (Env TcGblEnv TcLclEnv) Module
forall (m :: * -> *). HasModule m => m Module
getModule
       ; if Module
mod Module -> Module -> Bool
forall a. Eq a => a -> a -> Bool
== Module
gHC_TYPES
           then do { -- Build Module binding for GHC.Prim
                     TyCon
trModuleTyCon <- Name -> TcM TyCon
tcLookupTyCon Name
trModuleTyConName
                   ; let ghc_prim_module_id :: Id
ghc_prim_module_id =
                             Name -> Type -> Id
mkExportedVanillaId Name
trGhcPrimModuleName
                                                 (TyCon -> Type
mkTyConTy TyCon
trModuleTyCon)

                   ; LHsBind (GhcPass 'Typechecked)
ghc_prim_module_bind <- IdP (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsBind (GhcPass 'Typechecked)
forall (p :: Pass).
IdP (GhcPass p) -> LHsExpr (GhcPass p) -> LHsBind (GhcPass p)
mkVarBind Id
IdP (GhcPass 'Typechecked)
ghc_prim_module_id
                                             (LHsExpr (GhcPass 'Typechecked) -> LHsBind (GhcPass 'Typechecked))
-> IOEnv (Env TcGblEnv TcLclEnv) (LHsExpr (GhcPass 'Typechecked))
-> IOEnv (Env TcGblEnv TcLclEnv) (LHsBind (GhcPass 'Typechecked))
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Module
-> IOEnv (Env TcGblEnv TcLclEnv) (LHsExpr (GhcPass 'Typechecked))
mkModIdRHS Module
gHC_PRIM

                     -- Extend our environment with above
                   ; TcGblEnv
gbl_env <- [Id] -> TcM TcGblEnv -> TcM TcGblEnv
forall a. [Id] -> TcM a -> TcM a
tcExtendGlobalValEnv [Id
ghc_prim_module_id]
                                                     TcM TcGblEnv
forall gbl lcl. TcRnIf gbl lcl gbl
getGblEnv
                   ; let gbl_env' :: TcGblEnv
gbl_env' = TcGblEnv
gbl_env TcGblEnv -> [LHsBinds (GhcPass 'Typechecked)] -> TcGblEnv
`addTypecheckedBinds`
                                    [LHsBind (GhcPass 'Typechecked) -> LHsBinds (GhcPass 'Typechecked)
forall a. a -> Bag a
unitBag LHsBind (GhcPass 'Typechecked)
ghc_prim_module_bind]

                     -- Build TypeRepTodos for built-in KindReps
                   ; TypeRepTodo
todo1 <- [(Type, Name)] -> TcM TypeRepTodo
todoForExportedKindReps [(Type, Name)]
builtInKindReps
                     -- Build TypeRepTodos for types in GHC.Prim
                   ; TypeRepTodo
todo2 <- Module -> Id -> [TyCon] -> TcM TypeRepTodo
todoForTyCons Module
gHC_PRIM Id
ghc_prim_module_id
                                            [TyCon]
ghcPrimTypeableTyCons
                   ; (TcGblEnv, [TypeRepTodo])
-> TcRnIf TcGblEnv TcLclEnv (TcGblEnv, [TypeRepTodo])
forall (m :: * -> *) a. Monad m => a -> m a
return ( TcGblEnv
gbl_env' , [TypeRepTodo
todo1, TypeRepTodo
todo2])
                   }
           else do TcGblEnv
gbl_env <- TcM TcGblEnv
forall gbl lcl. TcRnIf gbl lcl gbl
getGblEnv
                   (TcGblEnv, [TypeRepTodo])
-> TcRnIf TcGblEnv TcLclEnv (TcGblEnv, [TypeRepTodo])
forall (m :: * -> *) a. Monad m => a -> m a
return (TcGblEnv
gbl_env, [])
       }

-- | This is the list of primitive 'TyCon's for which we must generate bindings
-- in "GHC.Types". This should include all types defined in "GHC.Prim".
--
-- The majority of the types we need here are contained in 'primTyCons'.
-- However, not all of them: in particular unboxed tuples are absent since we
-- don't want to include them in the original name cache. See
-- Note [Built-in syntax and the OrigNameCache] in IfaceEnv for more.
ghcPrimTypeableTyCons :: [TyCon]
ghcPrimTypeableTyCons :: [TyCon]
ghcPrimTypeableTyCons = [[TyCon]] -> [TyCon]
forall (t :: * -> *) a. Foldable t => t [a] -> [a]
concat
    [ [ TyCon
runtimeRepTyCon, TyCon
vecCountTyCon, TyCon
vecElemTyCon, TyCon
funTyCon ]
    , (Arity -> TyCon) -> [Arity] -> [TyCon]
forall a b. (a -> b) -> [a] -> [b]
map (Boxity -> Arity -> TyCon
tupleTyCon Boxity
Unboxed) [0..Arity
mAX_TUPLE_SIZE]
    , (Arity -> TyCon) -> [Arity] -> [TyCon]
forall a b. (a -> b) -> [a] -> [b]
map Arity -> TyCon
sumTyCon [2..Arity
mAX_SUM_SIZE]
    , [TyCon]
primTyCons
    ]

data TypeableStuff
    = Stuff { TypeableStuff -> DynFlags
dflags         :: DynFlags
            , TypeableStuff -> DataCon
trTyConDataCon :: DataCon         -- ^ of @TyCon@
            , TypeableStuff -> FastString -> LHsExpr (GhcPass 'Typechecked)
trNameLit      :: FastString -> LHsExpr GhcTc
                                                -- ^ To construct @TrName@s
              -- The various TyCon and DataCons of KindRep
            , TypeableStuff -> TyCon
kindRepTyCon           :: TyCon
            , TypeableStuff -> DataCon
kindRepTyConAppDataCon :: DataCon
            , TypeableStuff -> DataCon
kindRepVarDataCon      :: DataCon
            , TypeableStuff -> DataCon
kindRepAppDataCon      :: DataCon
            , TypeableStuff -> DataCon
kindRepFunDataCon      :: DataCon
            , TypeableStuff -> DataCon
kindRepTYPEDataCon     :: DataCon
            , TypeableStuff -> DataCon
kindRepTypeLitSDataCon :: DataCon
            , TypeableStuff -> DataCon
typeLitSymbolDataCon   :: DataCon
            , TypeableStuff -> DataCon
typeLitNatDataCon      :: DataCon
            }

-- | Collect various tidbits which we'll need to generate TyCon representations.
collect_stuff :: TcM TypeableStuff
collect_stuff :: TcM TypeableStuff
collect_stuff = do
    DynFlags
dflags <- IOEnv (Env TcGblEnv TcLclEnv) DynFlags
forall (m :: * -> *). HasDynFlags m => m DynFlags
getDynFlags
    DataCon
trTyConDataCon         <- Name -> TcM DataCon
tcLookupDataCon Name
trTyConDataConName
    TyCon
kindRepTyCon           <- Name -> TcM TyCon
tcLookupTyCon   Name
kindRepTyConName
    DataCon
kindRepTyConAppDataCon <- Name -> TcM DataCon
tcLookupDataCon Name
kindRepTyConAppDataConName
    DataCon
kindRepVarDataCon      <- Name -> TcM DataCon
tcLookupDataCon Name
kindRepVarDataConName
    DataCon
kindRepAppDataCon      <- Name -> TcM DataCon
tcLookupDataCon Name
kindRepAppDataConName
    DataCon
kindRepFunDataCon      <- Name -> TcM DataCon
tcLookupDataCon Name
kindRepFunDataConName
    DataCon
kindRepTYPEDataCon     <- Name -> TcM DataCon
tcLookupDataCon Name
kindRepTYPEDataConName
    DataCon
kindRepTypeLitSDataCon <- Name -> TcM DataCon
tcLookupDataCon Name
kindRepTypeLitSDataConName
    DataCon
typeLitSymbolDataCon   <- Name -> TcM DataCon
tcLookupDataCon Name
typeLitSymbolDataConName
    DataCon
typeLitNatDataCon      <- Name -> TcM DataCon
tcLookupDataCon Name
typeLitNatDataConName
    FastString -> LHsExpr (GhcPass 'Typechecked)
trNameLit              <- TcM (FastString -> LHsExpr (GhcPass 'Typechecked))
mkTrNameLit
    TypeableStuff -> TcM TypeableStuff
forall (m :: * -> *) a. Monad m => a -> m a
return Stuff :: DynFlags
-> DataCon
-> (FastString -> LHsExpr (GhcPass 'Typechecked))
-> TyCon
-> DataCon
-> DataCon
-> DataCon
-> DataCon
-> DataCon
-> DataCon
-> DataCon
-> DataCon
-> TypeableStuff
Stuff {..}

-- | Lookup the necessary pieces to construct the @trNameLit@. We do this so we
-- can save the work of repeating lookups when constructing many TyCon
-- representations.
mkTrNameLit :: TcM (FastString -> LHsExpr GhcTc)
mkTrNameLit :: TcM (FastString -> LHsExpr (GhcPass 'Typechecked))
mkTrNameLit = do
    DataCon
trNameSDataCon <- Name -> TcM DataCon
tcLookupDataCon Name
trNameSDataConName
    let trNameLit :: FastString -> LHsExpr GhcTc
        trNameLit :: FastString -> LHsExpr (GhcPass 'Typechecked)
trNameLit fs :: FastString
fs = LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass). LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
nlHsPar (LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked))
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall a b. (a -> b) -> a -> b
$ DataCon -> LHsExpr (GhcPass 'Typechecked)
nlHsDataCon DataCon
trNameSDataCon
                       LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` HsLit (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (p :: Pass). HsLit (GhcPass p) -> LHsExpr (GhcPass p)
nlHsLit (FastString -> HsLit (GhcPass 'Typechecked)
forall (p :: Pass). FastString -> HsLit (GhcPass p)
mkHsStringPrimLit FastString
fs)
    (FastString -> LHsExpr (GhcPass 'Typechecked))
-> TcM (FastString -> LHsExpr (GhcPass 'Typechecked))
forall (m :: * -> *) a. Monad m => a -> m a
return FastString -> LHsExpr (GhcPass 'Typechecked)
trNameLit

-- | Make Typeable bindings for the given 'TyCon'.
mkTyConRepBinds :: TypeableStuff -> TypeRepTodo
                -> TypeableTyCon -> KindRepM (LHsBinds GhcTc)
mkTyConRepBinds :: TypeableStuff
-> TypeRepTodo
-> TypeableTyCon
-> KindRepM (LHsBinds (GhcPass 'Typechecked))
mkTyConRepBinds stuff :: TypeableStuff
stuff@(Stuff {..}) todo :: TypeRepTodo
todo (TypeableTyCon {..})
  = do -- Make a KindRep
       let (bndrs :: [TyCoVarBinder]
bndrs, kind :: Type
kind) = Type -> ([TyCoVarBinder], Type)
splitForAllVarBndrs (TyCon -> Type
tyConKind TyCon
tycon)
       TcRn () -> KindRepM ()
forall a. TcRn a -> KindRepM a
liftTc (TcRn () -> KindRepM ()) -> TcRn () -> KindRepM ()
forall a b. (a -> b) -> a -> b
$ String -> SDoc -> TcRn ()
traceTc "mkTyConKindRepBinds"
                        (TyCon -> SDoc
forall a. Outputable a => a -> SDoc
ppr TyCon
tycon SDoc -> SDoc -> SDoc
$$ Type -> SDoc
forall a. Outputable a => a -> SDoc
ppr (TyCon -> Type
tyConKind TyCon
tycon) SDoc -> SDoc -> SDoc
$$ Type -> SDoc
forall a. Outputable a => a -> SDoc
ppr Type
kind)
       let ctx :: CmEnv
ctx = [Id] -> CmEnv
mkDeBruijnContext ((TyCoVarBinder -> Id) -> [TyCoVarBinder] -> [Id]
forall a b. (a -> b) -> [a] -> [b]
map TyCoVarBinder -> Id
forall tv argf. VarBndr tv argf -> tv
binderVar [TyCoVarBinder]
bndrs)
       LHsExpr (GhcPass 'Typechecked)
kind_rep <- TypeableStuff
-> CmEnv -> Type -> KindRepM (LHsExpr (GhcPass 'Typechecked))
getKindRep TypeableStuff
stuff CmEnv
ctx Type
kind

       -- Make the TyCon binding
       let tycon_rep_rhs :: LHsExpr (GhcPass 'Typechecked)
tycon_rep_rhs = TypeableStuff
-> TypeRepTodo
-> TyCon
-> LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked)
mkTyConRepTyConRHS TypeableStuff
stuff TypeRepTodo
todo TyCon
tycon LHsExpr (GhcPass 'Typechecked)
kind_rep
           tycon_rep_bind :: LHsBind (GhcPass 'Typechecked)
tycon_rep_bind = IdP (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsBind (GhcPass 'Typechecked)
forall (p :: Pass).
IdP (GhcPass p) -> LHsExpr (GhcPass p) -> LHsBind (GhcPass p)
mkVarBind Id
IdP (GhcPass 'Typechecked)
tycon_rep_id LHsExpr (GhcPass 'Typechecked)
tycon_rep_rhs
       LHsBinds (GhcPass 'Typechecked)
-> KindRepM (LHsBinds (GhcPass 'Typechecked))
forall (m :: * -> *) a. Monad m => a -> m a
return (LHsBinds (GhcPass 'Typechecked)
 -> KindRepM (LHsBinds (GhcPass 'Typechecked)))
-> LHsBinds (GhcPass 'Typechecked)
-> KindRepM (LHsBinds (GhcPass 'Typechecked))
forall a b. (a -> b) -> a -> b
$ LHsBind (GhcPass 'Typechecked) -> LHsBinds (GhcPass 'Typechecked)
forall a. a -> Bag a
unitBag LHsBind (GhcPass 'Typechecked)
tycon_rep_bind

-- | Maps kinds to 'KindRep' bindings. This binding may either be defined in
-- some other module (in which case the @Maybe (LHsExpr Id@ will be 'Nothing')
-- or a binding which we generated in the current module (in which case it will
-- be 'Just' the RHS of the binding).
type KindRepEnv = TypeMap (Id, Maybe (LHsExpr GhcTc))

-- | A monad within which we will generate 'KindRep's. Here we keep an
-- environment containing 'KindRep's which we've already generated so we can
-- re-use them opportunistically.
newtype KindRepM a = KindRepM { KindRepM a -> StateT KindRepEnv TcRn a
unKindRepM :: StateT KindRepEnv TcRn a }
                   deriving (a -> KindRepM b -> KindRepM a
(a -> b) -> KindRepM a -> KindRepM b
(forall a b. (a -> b) -> KindRepM a -> KindRepM b)
-> (forall a b. a -> KindRepM b -> KindRepM a) -> Functor KindRepM
forall a b. a -> KindRepM b -> KindRepM a
forall a b. (a -> b) -> KindRepM a -> KindRepM b
forall (f :: * -> *).
(forall a b. (a -> b) -> f a -> f b)
-> (forall a b. a -> f b -> f a) -> Functor f
<$ :: a -> KindRepM b -> KindRepM a
$c<$ :: forall a b. a -> KindRepM b -> KindRepM a
fmap :: (a -> b) -> KindRepM a -> KindRepM b
$cfmap :: forall a b. (a -> b) -> KindRepM a -> KindRepM b
Functor, Functor KindRepM
a -> KindRepM a
Functor KindRepM =>
(forall a. a -> KindRepM a)
-> (forall a b. KindRepM (a -> b) -> KindRepM a -> KindRepM b)
-> (forall a b c.
    (a -> b -> c) -> KindRepM a -> KindRepM b -> KindRepM c)
-> (forall a b. KindRepM a -> KindRepM b -> KindRepM b)
-> (forall a b. KindRepM a -> KindRepM b -> KindRepM a)
-> Applicative KindRepM
KindRepM a -> KindRepM b -> KindRepM b
KindRepM a -> KindRepM b -> KindRepM a
KindRepM (a -> b) -> KindRepM a -> KindRepM b
(a -> b -> c) -> KindRepM a -> KindRepM b -> KindRepM c
forall a. a -> KindRepM a
forall a b. KindRepM a -> KindRepM b -> KindRepM a
forall a b. KindRepM a -> KindRepM b -> KindRepM b
forall a b. KindRepM (a -> b) -> KindRepM a -> KindRepM b
forall a b c.
(a -> b -> c) -> KindRepM a -> KindRepM b -> KindRepM c
forall (f :: * -> *).
Functor f =>
(forall a. a -> f a)
-> (forall a b. f (a -> b) -> f a -> f b)
-> (forall a b c. (a -> b -> c) -> f a -> f b -> f c)
-> (forall a b. f a -> f b -> f b)
-> (forall a b. f a -> f b -> f a)
-> Applicative f
<* :: KindRepM a -> KindRepM b -> KindRepM a
$c<* :: forall a b. KindRepM a -> KindRepM b -> KindRepM a
*> :: KindRepM a -> KindRepM b -> KindRepM b
$c*> :: forall a b. KindRepM a -> KindRepM b -> KindRepM b
liftA2 :: (a -> b -> c) -> KindRepM a -> KindRepM b -> KindRepM c
$cliftA2 :: forall a b c.
(a -> b -> c) -> KindRepM a -> KindRepM b -> KindRepM c
<*> :: KindRepM (a -> b) -> KindRepM a -> KindRepM b
$c<*> :: forall a b. KindRepM (a -> b) -> KindRepM a -> KindRepM b
pure :: a -> KindRepM a
$cpure :: forall a. a -> KindRepM a
$cp1Applicative :: Functor KindRepM
Applicative, Applicative KindRepM
a -> KindRepM a
Applicative KindRepM =>
(forall a b. KindRepM a -> (a -> KindRepM b) -> KindRepM b)
-> (forall a b. KindRepM a -> KindRepM b -> KindRepM b)
-> (forall a. a -> KindRepM a)
-> Monad KindRepM
KindRepM a -> (a -> KindRepM b) -> KindRepM b
KindRepM a -> KindRepM b -> KindRepM b
forall a. a -> KindRepM a
forall a b. KindRepM a -> KindRepM b -> KindRepM b
forall a b. KindRepM a -> (a -> KindRepM b) -> KindRepM b
forall (m :: * -> *).
Applicative m =>
(forall a b. m a -> (a -> m b) -> m b)
-> (forall a b. m a -> m b -> m b)
-> (forall a. a -> m a)
-> Monad m
return :: a -> KindRepM a
$creturn :: forall a. a -> KindRepM a
>> :: KindRepM a -> KindRepM b -> KindRepM b
$c>> :: forall a b. KindRepM a -> KindRepM b -> KindRepM b
>>= :: KindRepM a -> (a -> KindRepM b) -> KindRepM b
$c>>= :: forall a b. KindRepM a -> (a -> KindRepM b) -> KindRepM b
$cp1Monad :: Applicative KindRepM
Monad)

liftTc :: TcRn a -> KindRepM a
liftTc :: TcRn a -> KindRepM a
liftTc = StateT KindRepEnv TcRn a -> KindRepM a
forall a. StateT KindRepEnv TcRn a -> KindRepM a
KindRepM (StateT KindRepEnv TcRn a -> KindRepM a)
-> (TcRn a -> StateT KindRepEnv TcRn a) -> TcRn a -> KindRepM a
forall b c a. (b -> c) -> (a -> b) -> a -> c
. TcRn a -> StateT KindRepEnv TcRn a
forall (t :: (* -> *) -> * -> *) (m :: * -> *) a.
(MonadTrans t, Monad m) =>
m a -> t m a
lift

-- | We generate @KindRep@s for a few common kinds in @GHC.Types@ so that they
-- can be reused across modules.
builtInKindReps :: [(Kind, Name)]
builtInKindReps :: [(Type, Name)]
builtInKindReps =
    [ (Type
star, Name
starKindRepName)
    , (Type -> Type -> Type
mkFunTy Type
star Type
star, Name
starArrStarKindRepName)
    , ([Type] -> Type -> Type
mkFunTys [Type
star, Type
star] Type
star, Name
starArrStarArrStarKindRepName)
    ]
  where
    star :: Type
star = Type
liftedTypeKind

initialKindRepEnv :: TcRn KindRepEnv
initialKindRepEnv :: TcRn KindRepEnv
initialKindRepEnv = (KindRepEnv -> (Type, Name) -> TcRn KindRepEnv)
-> KindRepEnv -> [(Type, Name)] -> TcRn KindRepEnv
forall (m :: * -> *) a b.
Monad m =>
(a -> b -> m a) -> a -> [b] -> m a
foldlM KindRepEnv -> (Type, Name) -> TcRn KindRepEnv
forall a.
TypeMap (Id, Maybe a)
-> (Type, Name)
-> IOEnv (Env TcGblEnv TcLclEnv) (TypeMap (Id, Maybe a))
add_kind_rep KindRepEnv
forall a. TypeMap a
emptyTypeMap [(Type, Name)]
builtInKindReps
  where
    add_kind_rep :: TypeMap (Id, Maybe a)
-> (Type, Name)
-> IOEnv (Env TcGblEnv TcLclEnv) (TypeMap (Id, Maybe a))
add_kind_rep acc :: TypeMap (Id, Maybe a)
acc (k :: Type
k,n :: Name
n) = do
        Id
id <- Name -> TcM Id
tcLookupId Name
n
        TypeMap (Id, Maybe a)
-> IOEnv (Env TcGblEnv TcLclEnv) (TypeMap (Id, Maybe a))
forall (m :: * -> *) a. Monad m => a -> m a
return (TypeMap (Id, Maybe a)
 -> IOEnv (Env TcGblEnv TcLclEnv) (TypeMap (Id, Maybe a)))
-> TypeMap (Id, Maybe a)
-> IOEnv (Env TcGblEnv TcLclEnv) (TypeMap (Id, Maybe a))
forall a b. (a -> b) -> a -> b
$! TypeMap (Id, Maybe a)
-> Type -> (Id, Maybe a) -> TypeMap (Id, Maybe a)
forall a. TypeMap a -> Type -> a -> TypeMap a
extendTypeMap TypeMap (Id, Maybe a)
acc Type
k (Id
id, Maybe a
forall a. Maybe a
Nothing)

-- | Performed while compiling "GHC.Types" to generate the built-in 'KindRep's.
mkExportedKindReps :: TypeableStuff
                   -> [(Kind, Id)]  -- ^ the kinds to generate bindings for
                   -> KindRepM ()
mkExportedKindReps :: TypeableStuff -> [(Type, Id)] -> KindRepM ()
mkExportedKindReps stuff :: TypeableStuff
stuff@(Stuff {..}) = ((Type, Id) -> KindRepM ()) -> [(Type, Id)] -> KindRepM ()
forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ (Type, Id) -> KindRepM ()
kindrep_binding
  where
    empty_scope :: CmEnv
empty_scope = [Id] -> CmEnv
mkDeBruijnContext []

    kindrep_binding :: (Kind, Id) -> KindRepM ()
    kindrep_binding :: (Type, Id) -> KindRepM ()
kindrep_binding (kind :: Type
kind, rep_bndr :: Id
rep_bndr) = do
        -- We build the binding manually here instead of using mkKindRepRhs
        -- since the latter would find the built-in 'KindRep's in the
        -- 'KindRepEnv' (by virtue of being in 'initialKindRepEnv').
        LHsExpr (GhcPass 'Typechecked)
rhs <- TypeableStuff
-> CmEnv -> Type -> KindRepM (LHsExpr (GhcPass 'Typechecked))
mkKindRepRhs TypeableStuff
stuff CmEnv
empty_scope Type
kind
        CmEnv
-> Type -> Id -> LHsExpr (GhcPass 'Typechecked) -> KindRepM ()
addKindRepBind CmEnv
empty_scope Type
kind Id
rep_bndr LHsExpr (GhcPass 'Typechecked)
rhs

addKindRepBind :: CmEnv -> Kind -> Id -> LHsExpr GhcTc -> KindRepM ()
addKindRepBind :: CmEnv
-> Type -> Id -> LHsExpr (GhcPass 'Typechecked) -> KindRepM ()
addKindRepBind in_scope :: CmEnv
in_scope k :: Type
k bndr :: Id
bndr rhs :: LHsExpr (GhcPass 'Typechecked)
rhs =
    StateT KindRepEnv TcRn () -> KindRepM ()
forall a. StateT KindRepEnv TcRn a -> KindRepM a
KindRepM (StateT KindRepEnv TcRn () -> KindRepM ())
-> StateT KindRepEnv TcRn () -> KindRepM ()
forall a b. (a -> b) -> a -> b
$ (KindRepEnv -> KindRepEnv) -> StateT KindRepEnv TcRn ()
forall (m :: * -> *) s. Monad m => (s -> s) -> StateT s m ()
modify' ((KindRepEnv -> KindRepEnv) -> StateT KindRepEnv TcRn ())
-> (KindRepEnv -> KindRepEnv) -> StateT KindRepEnv TcRn ()
forall a b. (a -> b) -> a -> b
$
    \env :: KindRepEnv
env -> KindRepEnv
-> CmEnv
-> Type
-> (Id, Maybe (LHsExpr (GhcPass 'Typechecked)))
-> KindRepEnv
forall a. TypeMap a -> CmEnv -> Type -> a -> TypeMap a
extendTypeMapWithScope KindRepEnv
env CmEnv
in_scope Type
k (Id
bndr, LHsExpr (GhcPass 'Typechecked)
-> Maybe (LHsExpr (GhcPass 'Typechecked))
forall a. a -> Maybe a
Just LHsExpr (GhcPass 'Typechecked)
rhs)

-- | Run a 'KindRepM' and add the produced 'KindRep's to the typechecking
-- environment.
runKindRepM :: KindRepM a -> TcRn (TcGblEnv, a)
runKindRepM :: KindRepM a -> TcRn (TcGblEnv, a)
runKindRepM (KindRepM action :: StateT KindRepEnv TcRn a
action) = do
    KindRepEnv
kindRepEnv <- TcRn KindRepEnv
initialKindRepEnv
    (res :: a
res, reps_env :: KindRepEnv
reps_env) <- StateT KindRepEnv TcRn a -> KindRepEnv -> TcRn (a, KindRepEnv)
forall s (m :: * -> *) a. StateT s m a -> s -> m (a, s)
runStateT StateT KindRepEnv TcRn a
action KindRepEnv
kindRepEnv
    let rep_binds :: [(Id, LHsExpr (GhcPass 'Typechecked))]
rep_binds = ((Id, Maybe (LHsExpr (GhcPass 'Typechecked)))
 -> [(Id, LHsExpr (GhcPass 'Typechecked))]
 -> [(Id, LHsExpr (GhcPass 'Typechecked))])
-> [(Id, LHsExpr (GhcPass 'Typechecked))]
-> KindRepEnv
-> [(Id, LHsExpr (GhcPass 'Typechecked))]
forall a b. (a -> b -> b) -> b -> TypeMap a -> b
foldTypeMap (Id, Maybe (LHsExpr (GhcPass 'Typechecked)))
-> [(Id, LHsExpr (GhcPass 'Typechecked))]
-> [(Id, LHsExpr (GhcPass 'Typechecked))]
forall a b. (a, Maybe b) -> [(a, b)] -> [(a, b)]
to_bind_pair [] KindRepEnv
reps_env
        to_bind_pair :: (a, Maybe b) -> [(a, b)] -> [(a, b)]
to_bind_pair (bndr :: a
bndr, Just rhs :: b
rhs) rest :: [(a, b)]
rest = (a
bndr, b
rhs) (a, b) -> [(a, b)] -> [(a, b)]
forall a. a -> [a] -> [a]
: [(a, b)]
rest
        to_bind_pair (_, Nothing) rest :: [(a, b)]
rest = [(a, b)]
rest
    TcGblEnv
tcg_env <- [Id] -> TcM TcGblEnv -> TcM TcGblEnv
forall a. [Id] -> TcM a -> TcM a
tcExtendGlobalValEnv (((Id, LHsExpr (GhcPass 'Typechecked)) -> Id)
-> [(Id, LHsExpr (GhcPass 'Typechecked))] -> [Id]
forall a b. (a -> b) -> [a] -> [b]
map (Id, LHsExpr (GhcPass 'Typechecked)) -> Id
forall a b. (a, b) -> a
fst [(Id, LHsExpr (GhcPass 'Typechecked))]
rep_binds) TcM TcGblEnv
forall gbl lcl. TcRnIf gbl lcl gbl
getGblEnv
    let binds :: [LHsBind (GhcPass 'Typechecked)]
binds = ((Id, LHsExpr (GhcPass 'Typechecked))
 -> LHsBind (GhcPass 'Typechecked))
-> [(Id, LHsExpr (GhcPass 'Typechecked))]
-> [LHsBind (GhcPass 'Typechecked)]
forall a b. (a -> b) -> [a] -> [b]
map ((Id
 -> LHsExpr (GhcPass 'Typechecked)
 -> LHsBind (GhcPass 'Typechecked))
-> (Id, LHsExpr (GhcPass 'Typechecked))
-> LHsBind (GhcPass 'Typechecked)
forall a b c. (a -> b -> c) -> (a, b) -> c
uncurry Id
-> LHsExpr (GhcPass 'Typechecked) -> LHsBind (GhcPass 'Typechecked)
forall (p :: Pass).
IdP (GhcPass p) -> LHsExpr (GhcPass p) -> LHsBind (GhcPass p)
mkVarBind) [(Id, LHsExpr (GhcPass 'Typechecked))]
rep_binds
        tcg_env' :: TcGblEnv
tcg_env' = TcGblEnv
tcg_env TcGblEnv -> [LHsBinds (GhcPass 'Typechecked)] -> TcGblEnv
`addTypecheckedBinds` [[LHsBind (GhcPass 'Typechecked)] -> LHsBinds (GhcPass 'Typechecked)
forall a. [a] -> Bag a
listToBag [LHsBind (GhcPass 'Typechecked)]
binds]
    (TcGblEnv, a) -> TcRn (TcGblEnv, a)
forall (m :: * -> *) a. Monad m => a -> m a
return (TcGblEnv
tcg_env', a
res)

-- | Produce or find a 'KindRep' for the given kind.
getKindRep :: TypeableStuff -> CmEnv  -- ^ in-scope kind variables
           -> Kind   -- ^ the kind we want a 'KindRep' for
           -> KindRepM (LHsExpr GhcTc)
getKindRep :: TypeableStuff
-> CmEnv -> Type -> KindRepM (LHsExpr (GhcPass 'Typechecked))
getKindRep stuff :: TypeableStuff
stuff@(Stuff {..}) in_scope :: CmEnv
in_scope = Type -> KindRepM (LHsExpr (GhcPass 'Typechecked))
go
  where
    go :: Kind -> KindRepM (LHsExpr GhcTc)
    go :: Type -> KindRepM (LHsExpr (GhcPass 'Typechecked))
go = StateT KindRepEnv TcRn (LHsExpr (GhcPass 'Typechecked))
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall a. StateT KindRepEnv TcRn a -> KindRepM a
KindRepM (StateT KindRepEnv TcRn (LHsExpr (GhcPass 'Typechecked))
 -> KindRepM (LHsExpr (GhcPass 'Typechecked)))
-> (Type
    -> StateT KindRepEnv TcRn (LHsExpr (GhcPass 'Typechecked)))
-> Type
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (KindRepEnv
 -> IOEnv
      (Env TcGblEnv TcLclEnv)
      (LHsExpr (GhcPass 'Typechecked), KindRepEnv))
-> StateT KindRepEnv TcRn (LHsExpr (GhcPass 'Typechecked))
forall s (m :: * -> *) a. (s -> m (a, s)) -> StateT s m a
StateT ((KindRepEnv
  -> IOEnv
       (Env TcGblEnv TcLclEnv)
       (LHsExpr (GhcPass 'Typechecked), KindRepEnv))
 -> StateT KindRepEnv TcRn (LHsExpr (GhcPass 'Typechecked)))
-> (Type
    -> KindRepEnv
    -> IOEnv
         (Env TcGblEnv TcLclEnv)
         (LHsExpr (GhcPass 'Typechecked), KindRepEnv))
-> Type
-> StateT KindRepEnv TcRn (LHsExpr (GhcPass 'Typechecked))
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Type
-> KindRepEnv
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     (LHsExpr (GhcPass 'Typechecked), KindRepEnv)
go'

    go' :: Kind -> KindRepEnv -> TcRn (LHsExpr GhcTc, KindRepEnv)
    go' :: Type
-> KindRepEnv
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     (LHsExpr (GhcPass 'Typechecked), KindRepEnv)
go' k :: Type
k env :: KindRepEnv
env
        -- Look through type synonyms
      | Just k' :: Type
k' <- Type -> Maybe Type
tcView Type
k = Type
-> KindRepEnv
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     (LHsExpr (GhcPass 'Typechecked), KindRepEnv)
go' Type
k' KindRepEnv
env

        -- We've already generated the needed KindRep
      | Just (id :: Id
id, _) <- KindRepEnv
-> CmEnv
-> Type
-> Maybe (Id, Maybe (LHsExpr (GhcPass 'Typechecked)))
forall a. TypeMap a -> CmEnv -> Type -> Maybe a
lookupTypeMapWithScope KindRepEnv
env CmEnv
in_scope Type
k
      = (LHsExpr (GhcPass 'Typechecked), KindRepEnv)
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     (LHsExpr (GhcPass 'Typechecked), KindRepEnv)
forall (m :: * -> *) a. Monad m => a -> m a
return (IdP (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass). IdP (GhcPass id) -> LHsExpr (GhcPass id)
nlHsVar Id
IdP (GhcPass 'Typechecked)
id, KindRepEnv
env)

        -- We need to construct a new KindRep binding
      | Bool
otherwise
      = do -- Place a NOINLINE pragma on KindReps since they tend to be quite
           -- large and bloat interface files.
           Id
rep_bndr <- (Id -> InlinePragma -> Id
`setInlinePragma` InlinePragma
neverInlinePragma)
                   (Id -> Id) -> TcM Id -> TcM Id
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> FastString -> Type -> TcM Id
forall gbl lcl. FastString -> Type -> TcRnIf gbl lcl Id
newSysLocalId (String -> FastString
fsLit "$krep") (TyCon -> Type
mkTyConTy TyCon
kindRepTyCon)

           -- do we need to tie a knot here?
           (StateT KindRepEnv TcRn (LHsExpr (GhcPass 'Typechecked))
 -> KindRepEnv
 -> IOEnv
      (Env TcGblEnv TcLclEnv)
      (LHsExpr (GhcPass 'Typechecked), KindRepEnv))
-> KindRepEnv
-> StateT KindRepEnv TcRn (LHsExpr (GhcPass 'Typechecked))
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     (LHsExpr (GhcPass 'Typechecked), KindRepEnv)
forall a b c. (a -> b -> c) -> b -> a -> c
flip StateT KindRepEnv TcRn (LHsExpr (GhcPass 'Typechecked))
-> KindRepEnv
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     (LHsExpr (GhcPass 'Typechecked), KindRepEnv)
forall s (m :: * -> *) a. StateT s m a -> s -> m (a, s)
runStateT KindRepEnv
env (StateT KindRepEnv TcRn (LHsExpr (GhcPass 'Typechecked))
 -> IOEnv
      (Env TcGblEnv TcLclEnv)
      (LHsExpr (GhcPass 'Typechecked), KindRepEnv))
-> StateT KindRepEnv TcRn (LHsExpr (GhcPass 'Typechecked))
-> IOEnv
     (Env TcGblEnv TcLclEnv)
     (LHsExpr (GhcPass 'Typechecked), KindRepEnv)
forall a b. (a -> b) -> a -> b
$ KindRepM (LHsExpr (GhcPass 'Typechecked))
-> StateT KindRepEnv TcRn (LHsExpr (GhcPass 'Typechecked))
forall a. KindRepM a -> StateT KindRepEnv TcRn a
unKindRepM (KindRepM (LHsExpr (GhcPass 'Typechecked))
 -> StateT KindRepEnv TcRn (LHsExpr (GhcPass 'Typechecked)))
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
-> StateT KindRepEnv TcRn (LHsExpr (GhcPass 'Typechecked))
forall a b. (a -> b) -> a -> b
$ do
               LHsExpr (GhcPass 'Typechecked)
rhs <- TypeableStuff
-> CmEnv -> Type -> KindRepM (LHsExpr (GhcPass 'Typechecked))
mkKindRepRhs TypeableStuff
stuff CmEnv
in_scope Type
k
               CmEnv
-> Type -> Id -> LHsExpr (GhcPass 'Typechecked) -> KindRepM ()
addKindRepBind CmEnv
in_scope Type
k Id
rep_bndr LHsExpr (GhcPass 'Typechecked)
rhs
               LHsExpr (GhcPass 'Typechecked)
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall (m :: * -> *) a. Monad m => a -> m a
return (LHsExpr (GhcPass 'Typechecked)
 -> KindRepM (LHsExpr (GhcPass 'Typechecked)))
-> LHsExpr (GhcPass 'Typechecked)
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall a b. (a -> b) -> a -> b
$ IdP (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass). IdP (GhcPass id) -> LHsExpr (GhcPass id)
nlHsVar Id
IdP (GhcPass 'Typechecked)
rep_bndr

-- | Construct the right-hand-side of the 'KindRep' for the given 'Kind' and
-- in-scope kind variable set.
mkKindRepRhs :: TypeableStuff
             -> CmEnv       -- ^ in-scope kind variables
             -> Kind        -- ^ the kind we want a 'KindRep' for
             -> KindRepM (LHsExpr GhcTc) -- ^ RHS expression
mkKindRepRhs :: TypeableStuff
-> CmEnv -> Type -> KindRepM (LHsExpr (GhcPass 'Typechecked))
mkKindRepRhs stuff :: TypeableStuff
stuff@(Stuff {..}) in_scope :: CmEnv
in_scope = Type -> KindRepM (LHsExpr (GhcPass 'Typechecked))
new_kind_rep
  where
    new_kind_rep :: Type -> KindRepM (LHsExpr (GhcPass 'Typechecked))
new_kind_rep k :: Type
k
        -- We handle (TYPE LiftedRep) etc separately to make it
        -- clear to consumers (e.g. serializers) that there is
        -- a loop here (as TYPE :: RuntimeRep -> TYPE 'LiftedRep)
      | Bool -> Bool
not (Type -> Bool
tcIsConstraintKind Type
k)    -- Typeable respects the Constraint/* distinction
                                      -- so do not follow the special case here
      , Just arg :: Type
arg <- HasDebugCallStack => Type -> Maybe Type
Type -> Maybe Type
kindRep_maybe Type
k
      , Just (tc :: TyCon
tc, []) <- HasDebugCallStack => Type -> Maybe (TyCon, [Type])
Type -> Maybe (TyCon, [Type])
splitTyConApp_maybe Type
arg
      , Just dc :: DataCon
dc <- TyCon -> Maybe DataCon
isPromotedDataCon_maybe TyCon
tc
      = LHsExpr (GhcPass 'Typechecked)
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall (m :: * -> *) a. Monad m => a -> m a
return (LHsExpr (GhcPass 'Typechecked)
 -> KindRepM (LHsExpr (GhcPass 'Typechecked)))
-> LHsExpr (GhcPass 'Typechecked)
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall a b. (a -> b) -> a -> b
$ DataCon -> LHsExpr (GhcPass 'Typechecked)
nlHsDataCon DataCon
kindRepTYPEDataCon LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` DataCon -> LHsExpr (GhcPass 'Typechecked)
nlHsDataCon DataCon
dc

    new_kind_rep (TyVarTy v :: Id
v)
      | Just idx :: Arity
idx <- CmEnv -> Id -> Maybe Arity
lookupCME CmEnv
in_scope Id
v
      = LHsExpr (GhcPass 'Typechecked)
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall (m :: * -> *) a. Monad m => a -> m a
return (LHsExpr (GhcPass 'Typechecked)
 -> KindRepM (LHsExpr (GhcPass 'Typechecked)))
-> LHsExpr (GhcPass 'Typechecked)
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall a b. (a -> b) -> a -> b
$ DataCon -> LHsExpr (GhcPass 'Typechecked)
nlHsDataCon DataCon
kindRepVarDataCon
                 LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` Integer -> LHsExpr (GhcPass 'Typechecked)
forall (p :: Pass). Integer -> LHsExpr (GhcPass p)
nlHsIntLit (Arity -> Integer
forall a b. (Integral a, Num b) => a -> b
fromIntegral Arity
idx)
      | Bool
otherwise
      = String -> SDoc -> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall a. HasCallStack => String -> SDoc -> a
pprPanic "mkTyConKindRepBinds.go(tyvar)" (Id -> SDoc
forall a. Outputable a => a -> SDoc
ppr Id
v)

    new_kind_rep (AppTy t1 :: Type
t1 t2 :: Type
t2)
      = do LHsExpr (GhcPass 'Typechecked)
rep1 <- TypeableStuff
-> CmEnv -> Type -> KindRepM (LHsExpr (GhcPass 'Typechecked))
getKindRep TypeableStuff
stuff CmEnv
in_scope Type
t1
           LHsExpr (GhcPass 'Typechecked)
rep2 <- TypeableStuff
-> CmEnv -> Type -> KindRepM (LHsExpr (GhcPass 'Typechecked))
getKindRep TypeableStuff
stuff CmEnv
in_scope Type
t2
           LHsExpr (GhcPass 'Typechecked)
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall (m :: * -> *) a. Monad m => a -> m a
return (LHsExpr (GhcPass 'Typechecked)
 -> KindRepM (LHsExpr (GhcPass 'Typechecked)))
-> LHsExpr (GhcPass 'Typechecked)
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall a b. (a -> b) -> a -> b
$ DataCon -> LHsExpr (GhcPass 'Typechecked)
nlHsDataCon DataCon
kindRepAppDataCon
                    LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` LHsExpr (GhcPass 'Typechecked)
rep1 LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` LHsExpr (GhcPass 'Typechecked)
rep2

    new_kind_rep k :: Type
k@(TyConApp tc :: TyCon
tc tys :: [Type]
tys)
      | Just rep_name :: Name
rep_name <- TyCon -> Maybe Name
tyConRepName_maybe TyCon
tc
      = do Id
rep_id <- TcM Id -> KindRepM Id
forall a. TcRn a -> KindRepM a
liftTc (TcM Id -> KindRepM Id) -> TcM Id -> KindRepM Id
forall a b. (a -> b) -> a -> b
$ Name -> TcM Id
forall (m :: * -> *). MonadThings m => Name -> m Id
lookupId Name
rep_name
           [LHsExpr (GhcPass 'Typechecked)]
tys' <- (Type -> KindRepM (LHsExpr (GhcPass 'Typechecked)))
-> [Type] -> KindRepM [LHsExpr (GhcPass 'Typechecked)]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM (TypeableStuff
-> CmEnv -> Type -> KindRepM (LHsExpr (GhcPass 'Typechecked))
getKindRep TypeableStuff
stuff CmEnv
in_scope) [Type]
tys
           LHsExpr (GhcPass 'Typechecked)
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall (m :: * -> *) a. Monad m => a -> m a
return (LHsExpr (GhcPass 'Typechecked)
 -> KindRepM (LHsExpr (GhcPass 'Typechecked)))
-> LHsExpr (GhcPass 'Typechecked)
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall a b. (a -> b) -> a -> b
$ DataCon -> LHsExpr (GhcPass 'Typechecked)
nlHsDataCon DataCon
kindRepTyConAppDataCon
                    LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` IdP (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass). IdP (GhcPass id) -> LHsExpr (GhcPass id)
nlHsVar Id
IdP (GhcPass 'Typechecked)
rep_id
                    LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` Type
-> [LHsExpr (GhcPass 'Typechecked)]
-> LHsExpr (GhcPass 'Typechecked)
mkList (TyCon -> Type
mkTyConTy TyCon
kindRepTyCon) [LHsExpr (GhcPass 'Typechecked)]
tys'
      | Bool
otherwise
      = String -> SDoc -> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall a. HasCallStack => String -> SDoc -> a
pprPanic "mkTyConKindRepBinds(TyConApp)" (TyCon -> SDoc
forall a. Outputable a => a -> SDoc
ppr TyCon
tc SDoc -> SDoc -> SDoc
$$ Type -> SDoc
forall a. Outputable a => a -> SDoc
ppr Type
k)

    new_kind_rep (ForAllTy (Bndr var :: Id
var _) ty :: Type
ty)
      = String -> SDoc -> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall a. HasCallStack => String -> SDoc -> a
pprPanic "mkTyConKindRepBinds(ForAllTy)" (Id -> SDoc
forall a. Outputable a => a -> SDoc
ppr Id
var SDoc -> SDoc -> SDoc
$$ Type -> SDoc
forall a. Outputable a => a -> SDoc
ppr Type
ty)

    new_kind_rep (FunTy t1 :: Type
t1 t2 :: Type
t2)
      = do LHsExpr (GhcPass 'Typechecked)
rep1 <- TypeableStuff
-> CmEnv -> Type -> KindRepM (LHsExpr (GhcPass 'Typechecked))
getKindRep TypeableStuff
stuff CmEnv
in_scope Type
t1
           LHsExpr (GhcPass 'Typechecked)
rep2 <- TypeableStuff
-> CmEnv -> Type -> KindRepM (LHsExpr (GhcPass 'Typechecked))
getKindRep TypeableStuff
stuff CmEnv
in_scope Type
t2
           LHsExpr (GhcPass 'Typechecked)
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall (m :: * -> *) a. Monad m => a -> m a
return (LHsExpr (GhcPass 'Typechecked)
 -> KindRepM (LHsExpr (GhcPass 'Typechecked)))
-> LHsExpr (GhcPass 'Typechecked)
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall a b. (a -> b) -> a -> b
$ DataCon -> LHsExpr (GhcPass 'Typechecked)
nlHsDataCon DataCon
kindRepFunDataCon
                    LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` LHsExpr (GhcPass 'Typechecked)
rep1 LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` LHsExpr (GhcPass 'Typechecked)
rep2

    new_kind_rep (LitTy (NumTyLit n :: Integer
n))
      = LHsExpr (GhcPass 'Typechecked)
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall (m :: * -> *) a. Monad m => a -> m a
return (LHsExpr (GhcPass 'Typechecked)
 -> KindRepM (LHsExpr (GhcPass 'Typechecked)))
-> LHsExpr (GhcPass 'Typechecked)
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall a b. (a -> b) -> a -> b
$ DataCon -> LHsExpr (GhcPass 'Typechecked)
nlHsDataCon DataCon
kindRepTypeLitSDataCon
                 LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` DataCon -> LHsExpr (GhcPass 'Typechecked)
nlHsDataCon DataCon
typeLitNatDataCon
                 LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` HsLit (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (p :: Pass). HsLit (GhcPass p) -> LHsExpr (GhcPass p)
nlHsLit (FastString -> HsLit (GhcPass 'Typechecked)
forall (p :: Pass). FastString -> HsLit (GhcPass p)
mkHsStringPrimLit (FastString -> HsLit (GhcPass 'Typechecked))
-> FastString -> HsLit (GhcPass 'Typechecked)
forall a b. (a -> b) -> a -> b
$ String -> FastString
mkFastString (String -> FastString) -> String -> FastString
forall a b. (a -> b) -> a -> b
$ Integer -> String
forall a. Show a => a -> String
show Integer
n)

    new_kind_rep (LitTy (StrTyLit s :: FastString
s))
      = LHsExpr (GhcPass 'Typechecked)
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall (m :: * -> *) a. Monad m => a -> m a
return (LHsExpr (GhcPass 'Typechecked)
 -> KindRepM (LHsExpr (GhcPass 'Typechecked)))
-> LHsExpr (GhcPass 'Typechecked)
-> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall a b. (a -> b) -> a -> b
$ DataCon -> LHsExpr (GhcPass 'Typechecked)
nlHsDataCon DataCon
kindRepTypeLitSDataCon
                 LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` DataCon -> LHsExpr (GhcPass 'Typechecked)
nlHsDataCon DataCon
typeLitSymbolDataCon
                 LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` HsLit (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (p :: Pass). HsLit (GhcPass p) -> LHsExpr (GhcPass p)
nlHsLit (FastString -> HsLit (GhcPass 'Typechecked)
forall (p :: Pass). FastString -> HsLit (GhcPass p)
mkHsStringPrimLit (FastString -> HsLit (GhcPass 'Typechecked))
-> FastString -> HsLit (GhcPass 'Typechecked)
forall a b. (a -> b) -> a -> b
$ String -> FastString
mkFastString (String -> FastString) -> String -> FastString
forall a b. (a -> b) -> a -> b
$ FastString -> String
forall a. Show a => a -> String
show FastString
s)

    new_kind_rep (CastTy ty :: Type
ty co :: KindCoercion
co)
      = String -> SDoc -> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall a. HasCallStack => String -> SDoc -> a
pprPanic "mkTyConKindRepBinds.go(cast)" (Type -> SDoc
forall a. Outputable a => a -> SDoc
ppr Type
ty SDoc -> SDoc -> SDoc
$$ KindCoercion -> SDoc
forall a. Outputable a => a -> SDoc
ppr KindCoercion
co)

    new_kind_rep (CoercionTy co :: KindCoercion
co)
      = String -> SDoc -> KindRepM (LHsExpr (GhcPass 'Typechecked))
forall a. HasCallStack => String -> SDoc -> a
pprPanic "mkTyConKindRepBinds.go(coercion)" (KindCoercion -> SDoc
forall a. Outputable a => a -> SDoc
ppr KindCoercion
co)

-- | Produce the right-hand-side of a @TyCon@ representation.
mkTyConRepTyConRHS :: TypeableStuff -> TypeRepTodo
                   -> TyCon      -- ^ the 'TyCon' we are producing a binding for
                   -> LHsExpr GhcTc -- ^ its 'KindRep'
                   -> LHsExpr GhcTc
mkTyConRepTyConRHS :: TypeableStuff
-> TypeRepTodo
-> TyCon
-> LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked)
mkTyConRepTyConRHS (Stuff {..}) todo :: TypeRepTodo
todo tycon :: TyCon
tycon kind_rep :: LHsExpr (GhcPass 'Typechecked)
kind_rep
  =           DataCon -> LHsExpr (GhcPass 'Typechecked)
nlHsDataCon DataCon
trTyConDataCon
    LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` HsLit (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (p :: Pass). HsLit (GhcPass p) -> LHsExpr (GhcPass p)
nlHsLit (DynFlags -> Word64 -> HsLit (GhcPass 'Typechecked)
word64 DynFlags
dflags Word64
high)
    LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` HsLit (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (p :: Pass). HsLit (GhcPass p) -> LHsExpr (GhcPass p)
nlHsLit (DynFlags -> Word64 -> HsLit (GhcPass 'Typechecked)
word64 DynFlags
dflags Word64
low)
    LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` TypeRepTodo -> LHsExpr (GhcPass 'Typechecked)
mod_rep_expr TypeRepTodo
todo
    LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` FastString -> LHsExpr (GhcPass 'Typechecked)
trNameLit (String -> FastString
mkFastString String
tycon_str)
    LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` HsLit (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (p :: Pass). HsLit (GhcPass p) -> LHsExpr (GhcPass p)
nlHsLit (Arity -> HsLit (GhcPass 'Typechecked)
int Arity
n_kind_vars)
    LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` LHsExpr (GhcPass 'Typechecked)
kind_rep
  where
    n_kind_vars :: Arity
n_kind_vars = [TyConBinder] -> Arity
forall (t :: * -> *) a. Foldable t => t a -> Arity
length ([TyConBinder] -> Arity) -> [TyConBinder] -> Arity
forall a b. (a -> b) -> a -> b
$ (TyConBinder -> Bool) -> [TyConBinder] -> [TyConBinder]
forall a. (a -> Bool) -> [a] -> [a]
filter TyConBinder -> Bool
isNamedTyConBinder (TyCon -> [TyConBinder]
tyConBinders TyCon
tycon)
    tycon_str :: String
tycon_str = String -> String
add_tick (OccName -> String
occNameString (TyCon -> OccName
forall a. NamedThing a => a -> OccName
getOccName TyCon
tycon))
    add_tick :: String -> String
add_tick s :: String
s | TyCon -> Bool
isPromotedDataCon TyCon
tycon = '\'' Char -> String -> String
forall a. a -> [a] -> [a]
: String
s
               | Bool
otherwise               = String
s

    -- This must match the computation done in
    -- Data.Typeable.Internal.mkTyConFingerprint.
    Fingerprint high :: Word64
high low :: Word64
low = [Fingerprint] -> Fingerprint
fingerprintFingerprints [ TypeRepTodo -> Fingerprint
pkg_fingerprint TypeRepTodo
todo
                                                   , TypeRepTodo -> Fingerprint
mod_fingerprint TypeRepTodo
todo
                                                   , String -> Fingerprint
fingerprintString String
tycon_str
                                                   ]

    int :: Int -> HsLit GhcTc
    int :: Arity -> HsLit (GhcPass 'Typechecked)
int n :: Arity
n = XHsIntPrim (GhcPass 'Typechecked)
-> Integer -> HsLit (GhcPass 'Typechecked)
forall x. XHsIntPrim x -> Integer -> HsLit x
HsIntPrim (String -> SourceText
String -> XHsIntPrim (GhcPass 'Typechecked)
SourceText (String -> XHsIntPrim (GhcPass 'Typechecked))
-> String -> XHsIntPrim (GhcPass 'Typechecked)
forall a b. (a -> b) -> a -> b
$ Arity -> String
forall a. Show a => a -> String
show Arity
n) (Arity -> Integer
forall a. Integral a => a -> Integer
toInteger Arity
n)

word64 :: DynFlags -> Word64 -> HsLit GhcTc
word64 :: DynFlags -> Word64 -> HsLit (GhcPass 'Typechecked)
word64 dflags :: DynFlags
dflags n :: Word64
n
  | DynFlags -> Arity
wORD_SIZE DynFlags
dflags Arity -> Arity -> Bool
forall a. Eq a => a -> a -> Bool
== 4 = XHsWord64Prim (GhcPass 'Typechecked)
-> Integer -> HsLit (GhcPass 'Typechecked)
forall x. XHsWord64Prim x -> Integer -> HsLit x
HsWord64Prim SourceText
XHsWord64Prim (GhcPass 'Typechecked)
NoSourceText (Word64 -> Integer
forall a. Integral a => a -> Integer
toInteger Word64
n)
  | Bool
otherwise             = XHsWordPrim (GhcPass 'Typechecked)
-> Integer -> HsLit (GhcPass 'Typechecked)
forall x. XHsWordPrim x -> Integer -> HsLit x
HsWordPrim   SourceText
XHsWordPrim (GhcPass 'Typechecked)
NoSourceText (Word64 -> Integer
forall a. Integral a => a -> Integer
toInteger Word64
n)

{-
Note [Representing TyCon kinds: KindRep]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
One of the operations supported by Typeable is typeRepKind,

    typeRepKind :: TypeRep (a :: k) -> TypeRep k

Implementing this is a bit tricky for poly-kinded types like

    data Proxy (a :: k) :: Type
    -- Proxy :: forall k. k -> Type

The TypeRep encoding of `Proxy Type Int` looks like this:

    $tcProxy :: GHC.Types.TyCon
    $trInt   :: TypeRep Int
    TrType   :: TypeRep Type

    $trProxyType :: TypeRep (Proxy Type :: Type -> Type)
    $trProxyType = TrTyCon $tcProxy
                           [TrType]  -- kind variable instantiation
                           (tyConKind $tcProxy [TrType]) -- The TypeRep of
                                                         -- Type -> Type

    $trProxy :: TypeRep (Proxy Type Int)
    $trProxy = TrApp $trProxyType $trInt TrType

    $tkProxy :: GHC.Types.KindRep
    $tkProxy = KindRepFun (KindRepVar 0)
                          (KindRepTyConApp (KindRepTYPE LiftedRep) [])

Note how $trProxyType cannot use 'TrApp', because TypeRep cannot represent
polymorphic types.  So instead

 * $trProxyType uses 'TrTyCon' to apply Proxy to (the representations)
   of all its kind arguments. We can't represent a tycon that is
   applied to only some of its kind arguments.

 * In $tcProxy, the GHC.Types.TyCon structure for Proxy, we store a
   GHC.Types.KindRep, which represents the polymorphic kind of Proxy
       Proxy :: forall k. k->Type

 * A KindRep is just a recipe that we can instantiate with the
   argument kinds, using Data.Typeable.Internal.tyConKind and
   store in the relevant 'TypeRep' constructor.

   Data.Typeable.Internal.typeRepKind looks up the stored kinds.

 * In a KindRep, the kind variables are represented by 0-indexed
   de Bruijn numbers:

    type KindBndr = Int   -- de Bruijn index

    data KindRep = KindRepTyConApp TyCon [KindRep]
                 | KindRepVar !KindBndr
                 | KindRepApp KindRep KindRep
                 | KindRepFun KindRep KindRep
                 ...
-}

mkList :: Type -> [LHsExpr GhcTc] -> LHsExpr GhcTc
mkList :: Type
-> [LHsExpr (GhcPass 'Typechecked)]
-> LHsExpr (GhcPass 'Typechecked)
mkList ty :: Type
ty = (LHsExpr (GhcPass 'Typechecked)
 -> LHsExpr (GhcPass 'Typechecked)
 -> LHsExpr (GhcPass 'Typechecked))
-> LHsExpr (GhcPass 'Typechecked)
-> [LHsExpr (GhcPass 'Typechecked)]
-> LHsExpr (GhcPass 'Typechecked)
forall (t :: * -> *) a b.
Foldable t =>
(a -> b -> b) -> b -> t a -> b
foldr LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
consApp (Type -> LHsExpr (GhcPass 'Typechecked)
nilExpr Type
ty)
  where
    cons :: LHsExpr (GhcPass 'Typechecked)
cons = Type -> LHsExpr (GhcPass 'Typechecked)
consExpr Type
ty
    consApp :: LHsExpr GhcTc -> LHsExpr GhcTc -> LHsExpr GhcTc
    consApp :: LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
consApp x :: LHsExpr (GhcPass 'Typechecked)
x xs :: LHsExpr (GhcPass 'Typechecked)
xs = LHsExpr (GhcPass 'Typechecked)
cons LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` LHsExpr (GhcPass 'Typechecked)
x LHsExpr (GhcPass 'Typechecked)
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
LHsExpr (GhcPass id)
-> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
`nlHsApp` LHsExpr (GhcPass 'Typechecked)
xs

    nilExpr :: Type -> LHsExpr GhcTc
    nilExpr :: Type -> LHsExpr (GhcPass 'Typechecked)
nilExpr ty :: Type
ty = HsWrapper
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
HsWrapper -> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
mkLHsWrap ([Type] -> HsWrapper
mkWpTyApps [Type
ty]) (DataCon -> LHsExpr (GhcPass 'Typechecked)
nlHsDataCon DataCon
nilDataCon)

    consExpr :: Type -> LHsExpr GhcTc
    consExpr :: Type -> LHsExpr (GhcPass 'Typechecked)
consExpr ty :: Type
ty = HsWrapper
-> LHsExpr (GhcPass 'Typechecked) -> LHsExpr (GhcPass 'Typechecked)
forall (id :: Pass).
HsWrapper -> LHsExpr (GhcPass id) -> LHsExpr (GhcPass id)
mkLHsWrap ([Type] -> HsWrapper
mkWpTyApps [Type
ty]) (DataCon -> LHsExpr (GhcPass 'Typechecked)
nlHsDataCon DataCon
consDataCon)