    -- | This is where we define a mapping from Uniques to their associated
    -- known-key Names for things associated with tuples and sums. We use this
    -- mapping while deserializing known-key Names in interface file symbol tables,
    -- which are encoded as their Unique. See Note [Symbol table representation of
    -- names] for details.
    --

    module GHC.Builtin.Uniques
        ( -- * Looking up known-key names
          knownUniqueName

          -- * Getting the 'Unique's of 'Name's
          -- ** Anonymous sums
        , mkSumTyConUnique, mkSumDataConUnique
        , isSumTyConUnique

          -- ** Tuples
          -- *** Vanilla
        , mkTupleTyConUnique
        , mkTupleDataConUnique
        , isTupleTyConUnique
        , isTupleDataConLikeUnique
          -- *** Constraint
        , mkCTupleTyConUnique
        , mkCTupleDataConUnique
        , mkCTupleSelIdUnique

          -- ** Making built-in uniques
        , mkAlphaTyVarUnique
        , mkPrimOpIdUnique, mkPrimOpWrapperUnique
        , mkPreludeMiscIdUnique, mkPreludeDataConUnique
        , mkPreludeTyConUnique, mkPreludeClassUnique

        , mkRegSingleUnique, mkRegPairUnique, mkRegClassUnique, mkRegSubUnique
        , mkCostCentreUnique

        , varNSUnique, dataNSUnique, tvNSUnique, tcNSUnique
        , mkFldNSUnique, isFldNSUnique

        , mkBuiltinUnique
        , mkPseudoUniqueE

          -- ** Deriving uniques
          -- *** From TyCon name uniques
        , tyConRepNameUnique
          -- *** From DataCon name uniques
        , dataConWorkerUnique, dataConTyRepNameUnique

        , initExitJoinUnique

          -- Boxing data types
        , mkBoxingTyConUnique, boxingDataConUnique

        ) where

    import GHC.Prelude

    import {-# SOURCE #-} GHC.Builtin.Types
    import {-# SOURCE #-} GHC.Core.TyCon
    import {-# SOURCE #-} GHC.Core.DataCon
    import {-# SOURCE #-} GHC.Types.Id
    import {-# SOURCE #-} GHC.Types.Name
    import GHC.Types.Basic
    import GHC.Types.Unique
    import GHC.Data.FastString

    import GHC.Utils.Outputable
    import GHC.Utils.Panic

    import Data.Maybe
    import GHC.Utils.Word64 (word64ToInt)

    -- | Get the 'Name' associated with a known-key 'Unique'.
    knownUniqueName :: Unique -> Maybe Name
    knownUniqueName :: Unique -> Maybe Name
    knownUniqueName Unique
    u =
        case Char
    tag of
          Char
    'z' -> Name -> Maybe Name
    forall a. a -> Maybe a
    Just (Name -> Maybe Name) -> Name -> Maybe Name
    forall a b. (a -> b) -> a -> b
    $ Int -> Name
    getUnboxedSumName Int
    n
          Char
    '4' -> Name -> Maybe Name
    forall a. a -> Maybe a
    Just (Name -> Maybe Name) -> Name -> Maybe Name
    forall a b. (a -> b) -> a -> b
    $ Boxity -> Int -> Name
    getTupleTyConName Boxity
    Boxed Int
    n
          Char
    '5' -> Name -> Maybe Name
    forall a. a -> Maybe a
    Just (Name -> Maybe Name) -> Name -> Maybe Name
    forall a b. (a -> b) -> a -> b
    $ Boxity -> Int -> Name
    getTupleTyConName Boxity
    Unboxed Int
    n
          Char
    '7' -> Name -> Maybe Name
    forall a. a -> Maybe a
    Just (Name -> Maybe Name) -> Name -> Maybe Name
    forall a b. (a -> b) -> a -> b
    $ Boxity -> Int -> Name
    getTupleDataConName Boxity
    Boxed Int
    n
          Char
    '8' -> Name -> Maybe Name
    forall a. a -> Maybe a
    Just (Name -> Maybe Name) -> Name -> Maybe Name
    forall a b. (a -> b) -> a -> b
    $ Boxity -> Int -> Name
    getTupleDataConName Boxity
    Unboxed Int
    n
          Char
    'j' -> Name -> Maybe Name
    forall a. a -> Maybe a
    Just (Name -> Maybe Name) -> Name -> Maybe Name
    forall a b. (a -> b) -> a -> b
    $ Int -> Name
    getCTupleSelIdName Int
    n
          Char
    'k' -> Name -> Maybe Name
    forall a. a -> Maybe a
    Just (Name -> Maybe Name) -> Name -> Maybe Name
    forall a b. (a -> b) -> a -> b
    $ Int -> Name
    getCTupleTyConName Int
    n
          Char
    'm' -> Name -> Maybe Name
    forall a. a -> Maybe a
    Just (Name -> Maybe Name) -> Name -> Maybe Name
    forall a b. (a -> b) -> a -> b
    $ Int -> Name
    getCTupleDataConName Int
    n
          Char
    _   -> Maybe Name
    forall a. Maybe a
    Nothing
      where
        (Char
    tag, Word64
    n') = Unique -> (Char, Word64)
    unpkUnique Unique
    u
        -- Known unique names are guaranteed to fit in Int, so we don't need the whole Word64.
        n :: Int
    n = Bool -> Int -> Int
    forall a. HasCallStack => Bool -> a -> a
    assert (Unique -> Bool
    isValidKnownKeyUnique Unique
    u) (Word64 -> Int
    HasDebugCallStack => Word64 -> Int
    word64ToInt Word64
    n')

    {-
    Note [Unique layout for unboxed sums]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    Sum arities start from 2. The encoding is a bit funny: we break up the
    integral part into bitfields for the arity, an alternative index (which is
    taken to be 0xfc in the case of the TyCon), and, in the case of a datacon, a
    tag (used to identify the sum's TypeRep binding).

    This layout is chosen to remain compatible with the usual unique allocation
    for wired-in data constructors described in GHC.Types.Unique

    TyCon for sum of arity k:
      00000000 kkkkkkkk 11111100

    TypeRep of TyCon for sum of arity k:
      00000000 kkkkkkkk 11111101

    DataCon for sum of arity k and alternative n (zero-based):
      00000000 kkkkkkkk nnnnnn00

    TypeRep for sum DataCon of arity k and alternative n (zero-based):
      00000000 kkkkkkkk nnnnnn10
    -}

    mkSumTyConUnique :: Arity -> Unique
    mkSumTyConUnique :: Int -> Unique
    mkSumTyConUnique Int
    arity =
        Bool -> SDoc -> Unique -> Unique
    forall a. HasCallStack => Bool -> SDoc -> a -> a
    assertPpr (Int
    arity Int -> Int -> Bool
    forall a. Ord a => a -> a -> Bool
    <= Int
    0x3f) (Int -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr Int
    arity) (Unique -> Unique) -> Unique -> Unique
    forall a b. (a -> b) -> a -> b
    $
                  -- 0x3f since we only have 6 bits to encode the
                  -- alternative
        Char -> Int -> Unique
    mkUniqueInt Char
    'z' (Int
    arity Int -> Int -> Int
    forall a. Bits a => a -> Int -> a
    `shiftL` Int
    8 Int -> Int -> Int
    forall a. Bits a => a -> a -> a
    .|. Int
    0xfc)

    isSumTyConUnique :: Unique -> Maybe Arity
    isSumTyConUnique :: Unique -> Maybe Int
    isSumTyConUnique Unique
    u =
      case (Char
    tag, Word64
    n Word64 -> Word64 -> Word64
    forall a. Bits a => a -> a -> a
    .&. Word64
    0xfc) of
        (Char
    'z', Word64
    0xfc) -> Int -> Maybe Int
    forall a. a -> Maybe a
    Just (Word64 -> Int
    HasDebugCallStack => Word64 -> Int
    word64ToInt Word64
    n Int -> Int -> Int
    forall a. Bits a => a -> Int -> a
    `shiftR` Int
    8)
        (Char, Word64)
    _ -> Maybe Int
    forall a. Maybe a
    Nothing
      where
        (Char
    tag, Word64
    n) = Unique -> (Char, Word64)
    unpkUnique Unique
    u

    mkSumDataConUnique :: ConTagZ -> Arity -> Unique
    mkSumDataConUnique :: Int -> Int -> Unique
    mkSumDataConUnique Int
    alt Int
    arity
      | Int
    alt Int -> Int -> Bool
    forall a. Ord a => a -> a -> Bool
    >= Int
    arity
      = String -> Unique
    forall a. HasCallStack => String -> a
    panic (String
    "mkSumDataConUnique: " String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ Int -> String
    forall a. Show a => a -> String
    show Int
    alt String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    " >= " String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ Int -> String
    forall a. Show a => a -> String
    show Int
    arity)
      | Bool
    otherwise
      = Char -> Int -> Unique
    mkUniqueInt Char
    'z' (Int
    arity Int -> Int -> Int
    forall a. Bits a => a -> Int -> a
    `shiftL` Int
    8 Int -> Int -> Int
    forall a. Num a => a -> a -> a
    + Int
    alt Int -> Int -> Int
    forall a. Bits a => a -> Int -> a
    `shiftL` Int
    2) {- skip the tycon -}

    getUnboxedSumName :: Int -> Name
    getUnboxedSumName :: Int -> Name
    getUnboxedSumName Int
    n
      | Int
    n Int -> Int -> Int
    forall a. Bits a => a -> a -> a
    .&. Int
    0xfc Int -> Int -> Bool
    forall a. Eq a => a -> a -> Bool
    == Int
    0xfc
      = case Int
    tag of
          Int
    0x0 -> TyCon -> Name
    tyConName (TyCon -> Name) -> TyCon -> Name
    forall a b. (a -> b) -> a -> b
    $ Int -> TyCon
    sumTyCon Int
    arity
          Int
    0x1 -> TyCon -> Name
    getRep (TyCon -> Name) -> TyCon -> Name
    forall a b. (a -> b) -> a -> b
    $ Int -> TyCon
    sumTyCon Int
    arity
          Int
    _   -> String -> SDoc -> Name
    forall a. HasCallStack => String -> SDoc -> a
    pprPanic String
    "getUnboxedSumName: invalid tag" (Int -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr Int
    tag)
      | Int
    tag Int -> Int -> Bool
    forall a. Eq a => a -> a -> Bool
    == Int
    0x0
      = DataCon -> Name
    dataConName (DataCon -> Name) -> DataCon -> Name
    forall a b. (a -> b) -> a -> b
    $ Int -> Int -> DataCon
    sumDataCon (Int
    alt Int -> Int -> Int
    forall a. Num a => a -> a -> a
    + Int
    1) Int
    arity
      | Int
    tag Int -> Int -> Bool
    forall a. Eq a => a -> a -> Bool
    == Int
    0x1
      = Id -> Name
    forall a. NamedThing a => a -> Name
    getName (Id -> Name) -> Id -> Name
    forall a b. (a -> b) -> a -> b
    $ DataCon -> Id
    dataConWrapId (DataCon -> Id) -> DataCon -> Id
    forall a b. (a -> b) -> a -> b
    $ Int -> Int -> DataCon
    sumDataCon (Int
    alt Int -> Int -> Int
    forall a. Num a => a -> a -> a
    + Int
    1) Int
    arity
      | Int
    tag Int -> Int -> Bool
    forall a. Eq a => a -> a -> Bool
    == Int
    0x2
      = TyCon -> Name
    getRep (TyCon -> Name) -> TyCon -> Name
    forall a b. (a -> b) -> a -> b
    $ DataCon -> TyCon
    promoteDataCon (DataCon -> TyCon) -> DataCon -> TyCon
    forall a b. (a -> b) -> a -> b
    $ Int -> Int -> DataCon
    sumDataCon (Int
    alt Int -> Int -> Int
    forall a. Num a => a -> a -> a
    + Int
    1) Int
    arity
      | Bool
    otherwise
      = String -> SDoc -> Name
    forall a. HasCallStack => String -> SDoc -> a
    pprPanic String
    "getUnboxedSumName" (Int -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr Int
    n)
      where
        arity :: Int
    arity = Int
    n Int -> Int -> Int
    forall a. Bits a => a -> Int -> a
    `shiftR` Int
    8
        alt :: Int
    alt = (Int
    n Int -> Int -> Int
    forall a. Bits a => a -> a -> a
    .&. Int
    0xfc) Int -> Int -> Int
    forall a. Bits a => a -> Int -> a
    `shiftR` Int
    2
        tag :: Int
    tag = Int
    0x3 Int -> Int -> Int
    forall a. Bits a => a -> a -> a
    .&. Int
    n
        getRep :: TyCon -> Name
    getRep TyCon
    tycon =
            Name -> Maybe Name -> Name
    forall a. a -> Maybe a -> a
    fromMaybe (String -> SDoc -> Name
    forall a. HasCallStack => String -> SDoc -> a
    pprPanic String
    "getUnboxedSumName(getRep)" (TyCon -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr TyCon
    tycon))
            (Maybe Name -> Name) -> Maybe Name -> Name
    forall a b. (a -> b) -> a -> b
    $ TyCon -> Maybe Name
    tyConRepName_maybe TyCon
    tycon

    -- Note [Uniques for tuple type and data constructors]
    -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    -- Wired-in type constructor keys occupy *two* slots:
    --    * u: the TyCon itself
    --    * u+1: the TyConRepName of the TyCon
    --
    -- Wired-in tuple data constructor keys occupy *three* slots:
    --    * u: the DataCon itself
    --    * u+1: its worker Id
    --    * u+2: the TyConRepName of the promoted TyCon

    {-
    Note [Unique layout for constraint tuple selectors]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Constraint tuples, like boxed and unboxed tuples, have their type and data
    constructor Uniques wired in (see
    Note [Uniques for tuple type and data constructors]). Constraint tuples are
    somewhat more involved, however. For a boxed or unboxed n-tuple, we need:

    * A Unique for the type constructor, and
    * A Unique for the data constructor

    With a constraint n-tuple, however, we need:

    * A Unique for the type constructor,
    * A Unique for the data constructor, and
    * A Unique for each of the n superclass selectors

    To pick a concrete example (n = 2), the binary constraint tuple has a type
    constructor and data constructor (%,%) along with superclass selectors
    $p1(%,%) and $p2(%,%).

    Just as we wire in the Uniques for constraint tuple type constructors and data
    constructors, we wish to wire in the Uniques for the superclass selectors as
    well. Not only does this make everything consistent, it also avoids a
    compile-time performance penalty whenever GHC.Classes is loaded from an
    interface file. This is because GHC.Classes defines constraint tuples as class
    definitions, and if these classes weren't wired in, then loading GHC.Classes
    would also load every single constraint tuple type constructor, data
    constructor, and superclass selector. See #18635.

    We encode the Uniques for constraint tuple superclass selectors as follows. The
    integral part of the Unique is broken up into bitfields for the arity and the
    position of the superclass. Given a selector for a constraint tuple with
    arity n (zero-based) and position k (where 1 <= k <= n), its Unique will look
    like:

      00000000 nnnnnnnn kkkkkkkk

    We can use bit-twiddling tricks to access the arity and position with
    cTupleSelIdArityBits and cTupleSelIdPosBitmask, respectively.

    This pattern bears a certain resemblance to the way that the Uniques for
    unboxed sums are encoded. This is because for a unboxed sum of arity n, there
    are n corresponding data constructors, each with an alternative position k.
    Similarly, for a constraint tuple of arity n, there are n corresponding
    superclass selectors. Reading Note [Unique layout for unboxed sums] will
    instill an appreciation for how the encoding for constraint tuple superclass
    selector Uniques takes inspiration from the encoding for unboxed sum Uniques.
    -}

    mkCTupleTyConUnique :: Arity -> Unique
    mkCTupleTyConUnique :: Int -> Unique
    mkCTupleTyConUnique Int
    a = Char -> Int -> Unique
    mkUniqueInt Char
    'k' (Int
    2Int -> Int -> Int
    forall a. Num a => a -> a -> a
    *Int
    a)

    mkCTupleDataConUnique :: Arity -> Unique
    mkCTupleDataConUnique :: Int -> Unique
    mkCTupleDataConUnique Int
    a = Char -> Int -> Unique
    mkUniqueInt Char
    'm' (Int
    3Int -> Int -> Int
    forall a. Num a => a -> a -> a
    *Int
    a)

    mkCTupleSelIdUnique :: ConTagZ -> Arity -> Unique
    mkCTupleSelIdUnique :: Int -> Int -> Unique
    mkCTupleSelIdUnique Int
    sc_pos Int
    arity
      | Int
    sc_pos Int -> Int -> Bool
    forall a. Ord a => a -> a -> Bool
    >= Int
    arity
      = String -> Unique
    forall a. HasCallStack => String -> a
    panic (String
    "mkCTupleSelIdUnique: " String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ Int -> String
    forall a. Show a => a -> String
    show Int
    sc_pos String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    " >= " String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ Int -> String
    forall a. Show a => a -> String
    show Int
    arity)
      | Bool
    otherwise
      = Char -> Int -> Unique
    mkUniqueInt Char
    'j' (Int
    arity Int -> Int -> Int
    forall a. Bits a => a -> Int -> a
    `shiftL` Int
    cTupleSelIdArityBits Int -> Int -> Int
    forall a. Num a => a -> a -> a
    + Int
    sc_pos)

    getCTupleTyConName :: Int -> Name
    getCTupleTyConName :: Int -> Name
    getCTupleTyConName Int
    n =
        case Int
    n Int -> Int -> (Int, Int)
    forall a. Integral a => a -> a -> (a, a)
    `divMod` Int
    2 of
          (Int
    arity, Int
    0) -> Int -> Name
    cTupleTyConName Int
    arity
          (Int
    arity, Int
    1) -> Name -> Name
    mkPrelTyConRepName (Name -> Name) -> Name -> Name
    forall a b. (a -> b) -> a -> b
    $ Int -> Name
    cTupleTyConName Int
    arity
          (Int, Int)
    _          -> String -> Name
    forall a. HasCallStack => String -> a
    panic String
    "getCTupleTyConName: impossible"

    getCTupleDataConName :: Int -> Name
    getCTupleDataConName :: Int -> Name
    getCTupleDataConName Int
    n =
        case Int
    n Int -> Int -> (Int, Int)
    forall a. Integral a => a -> a -> (a, a)
    `divMod` Int
    3 of
          (Int
    arity,  Int
    0) -> Int -> Name
    cTupleDataConName Int
    arity
          (Int
    arity,  Int
    1) -> Id -> Name
    forall a. NamedThing a => a -> Name
    getName (Id -> Name) -> Id -> Name
    forall a b. (a -> b) -> a -> b
    $ DataCon -> Id
    dataConWrapId (DataCon -> Id) -> DataCon -> Id
    forall a b. (a -> b) -> a -> b
    $ Int -> DataCon
    cTupleDataCon Int
    arity
          (Int
    arity,  Int
    2) -> Name -> Name
    mkPrelTyConRepName (Name -> Name) -> Name -> Name
    forall a b. (a -> b) -> a -> b
    $ Int -> Name
    cTupleDataConName Int
    arity
          (Int, Int)
    _           -> String -> Name
    forall a. HasCallStack => String -> a
    panic String
    "getCTupleDataConName: impossible"

    getCTupleSelIdName :: Int -> Name
    getCTupleSelIdName :: Int -> Name
    getCTupleSelIdName Int
    n = Int -> Int -> Name
    cTupleSelIdName (Int
    sc_pos Int -> Int -> Int
    forall a. Num a => a -> a -> a
    + Int
    1) Int
    arity
      where
        arity :: Int
    arity  = Int
    n Int -> Int -> Int
    forall a. Bits a => a -> Int -> a
    `shiftR` Int
    cTupleSelIdArityBits
        sc_pos :: Int
    sc_pos = Int
    n Int -> Int -> Int
    forall a. Bits a => a -> a -> a
    .&. Int
    cTupleSelIdPosBitmask

    -- Given the arity of a constraint tuple, this is the number of bits by which
    -- one must shift it to the left in order to encode the arity in the Unique
    -- of a superclass selector for that constraint tuple. Alternatively, given the
    -- Unique for a constraint tuple superclass selector, this is the number of
    -- bits by which one must shift it to the right to retrieve the arity of the
    -- constraint tuple. See Note [Unique layout for constraint tuple selectors].
    cTupleSelIdArityBits :: Int
    cTupleSelIdArityBits :: Int
    cTupleSelIdArityBits = Int
    8

    -- Given the Unique for a constraint tuple superclass selector, one can
    -- retrieve the position of the selector by ANDing this mask, which will
    -- clear all but the eight least significant bits.
    -- See Note [Unique layout for constraint tuple selectors].
    cTupleSelIdPosBitmask :: Int
    cTupleSelIdPosBitmask :: Int
    cTupleSelIdPosBitmask = Int
    0xff

    --------------------------------------------------
    -- Normal tuples

    mkTupleDataConUnique :: Boxity -> Arity -> Unique
    mkTupleDataConUnique :: Boxity -> Int -> Unique
    mkTupleDataConUnique Boxity
    Boxed          Int
    a = Char -> Int -> Unique
    mkUniqueInt Char
    '7' (Int
    3Int -> Int -> Int
    forall a. Num a => a -> a -> a
    *Int
    a)    -- may be used in C labels
    mkTupleDataConUnique Boxity
    Unboxed        Int
    a = Char -> Int -> Unique
    mkUniqueInt Char
    '8' (Int
    3Int -> Int -> Int
    forall a. Num a => a -> a -> a
    *Int
    a)

    mkTupleTyConUnique :: Boxity -> Arity -> Unique
    mkTupleTyConUnique :: Boxity -> Int -> Unique
    mkTupleTyConUnique Boxity
    Boxed           Int
    a  = Char -> Int -> Unique
    mkUniqueInt Char
    '4' (Int
    2Int -> Int -> Int
    forall a. Num a => a -> a -> a
    *Int
    a)
    mkTupleTyConUnique Boxity
    Unboxed         Int
    a  = Char -> Int -> Unique
    mkUniqueInt Char
    '5' (Int
    2Int -> Int -> Int
    forall a. Num a => a -> a -> a
    *Int
    a)

    -- | This function is an inverse of `mkTupleTyConUnique`
    isTupleTyConUnique :: Unique -> Maybe (Boxity, Arity)
    isTupleTyConUnique :: Unique -> Maybe (Boxity, Int)
    isTupleTyConUnique Unique
    u =
      case (Char
    tag, Word64
    i) of
        (Char
    '4', Word64
    0) -> (Boxity, Int) -> Maybe (Boxity, Int)
    forall a. a -> Maybe a
    Just (Boxity
    Boxed,   Int
    arity)
        (Char
    '5', Word64
    0) -> (Boxity, Int) -> Maybe (Boxity, Int)
    forall a. a -> Maybe a
    Just (Boxity
    Unboxed, Int
    arity)
        (Char, Word64)
    _        -> Maybe (Boxity, Int)
    forall a. Maybe a
    Nothing
      where
        (Char
    tag,   Word64
    n) = Unique -> (Char, Word64)
    unpkUnique Unique
    u
        (Word64
    arity', Word64
    i) = Word64 -> Word64 -> (Word64, Word64)
    forall a. Integral a => a -> a -> (a, a)
    quotRem Word64
    n Word64
    2
        arity :: Int
    arity = Word64 -> Int
    HasDebugCallStack => Word64 -> Int
    word64ToInt Word64
    arity'

    -- | This function is an inverse of `mkTupleTyDataUnique` that also matches the worker and promoted tycon.
    isTupleDataConLikeUnique :: Unique -> Maybe (Boxity, Arity)
    isTupleDataConLikeUnique :: Unique -> Maybe (Boxity, Int)
    isTupleDataConLikeUnique Unique
    u =
      case Char
    tag of
        Char
    '7' -> (Boxity, Int) -> Maybe (Boxity, Int)
    forall a. a -> Maybe a
    Just (Boxity
    Boxed,   Int
    arity)
        Char
    '8' -> (Boxity, Int) -> Maybe (Boxity, Int)
    forall a. a -> Maybe a
    Just (Boxity
    Unboxed, Int
    arity)
        Char
    _ -> Maybe (Boxity, Int)
    forall a. Maybe a
    Nothing
      where
        (Char
    tag,   Word64
    n) = Unique -> (Char, Word64)
    unpkUnique Unique
    u
        (Word64
    arity', Word64
    _) = Word64 -> Word64 -> (Word64, Word64)
    forall a. Integral a => a -> a -> (a, a)
    quotRem Word64
    n Word64
    3
        arity :: Int
    arity = Word64 -> Int
    HasDebugCallStack => Word64 -> Int
    word64ToInt Word64
    arity'

    getTupleTyConName :: Boxity -> Int -> Name
    getTupleTyConName :: Boxity -> Int -> Name
    getTupleTyConName Boxity
    boxity Int
    n =
        case Int
    n Int -> Int -> (Int, Int)
    forall a. Integral a => a -> a -> (a, a)
    `divMod` Int
    2 of
          (Int
    arity, Int
    0) -> TyCon -> Name
    tyConName (TyCon -> Name) -> TyCon -> Name
    forall a b. (a -> b) -> a -> b
    $ Boxity -> Int -> TyCon
    tupleTyCon Boxity
    boxity Int
    arity
          (Int
    arity, Int
    1) -> Name -> Maybe Name -> Name
    forall a. a -> Maybe a -> a
    fromMaybe (String -> Name
    forall a. HasCallStack => String -> a
    panic String
    "getTupleTyConName")
                        (Maybe Name -> Name) -> Maybe Name -> Name
    forall a b. (a -> b) -> a -> b
    $ TyCon -> Maybe Name
    tyConRepName_maybe (TyCon -> Maybe Name) -> TyCon -> Maybe Name
    forall a b. (a -> b) -> a -> b
    $ Boxity -> Int -> TyCon
    tupleTyCon Boxity
    boxity Int
    arity
          (Int, Int)
    _          -> String -> Name
    forall a. HasCallStack => String -> a
    panic String
    "getTupleTyConName: impossible"

    getTupleDataConName :: Boxity -> Int -> Name
    getTupleDataConName :: Boxity -> Int -> Name
    getTupleDataConName Boxity
    boxity Int
    n =
        case Int
    n Int -> Int -> (Int, Int)
    forall a. Integral a => a -> a -> (a, a)
    `divMod` Int
    3 of
          (Int
    arity, Int
    0) -> DataCon -> Name
    dataConName (DataCon -> Name) -> DataCon -> Name
    forall a b. (a -> b) -> a -> b
    $ Boxity -> Int -> DataCon
    tupleDataCon Boxity
    boxity Int
    arity
          (Int
    arity, Int
    1) -> Id -> Name
    idName (Id -> Name) -> Id -> Name
    forall a b. (a -> b) -> a -> b
    $ DataCon -> Id
    dataConWorkId (DataCon -> Id) -> DataCon -> Id
    forall a b. (a -> b) -> a -> b
    $ Boxity -> Int -> DataCon
    tupleDataCon Boxity
    boxity Int
    arity
          (Int
    arity, Int
    2) -> Name -> Maybe Name -> Name
    forall a. a -> Maybe a -> a
    fromMaybe (String -> Name
    forall a. HasCallStack => String -> a
    panic String
    "getTupleDataCon")
                        (Maybe Name -> Name) -> Maybe Name -> Name
    forall a b. (a -> b) -> a -> b
    $ TyCon -> Maybe Name
    tyConRepName_maybe (TyCon -> Maybe Name) -> TyCon -> Maybe Name
    forall a b. (a -> b) -> a -> b
    $ Boxity -> Int -> TyCon
    promotedTupleDataCon Boxity
    boxity Int
    arity
          (Int, Int)
    _          -> String -> Name
    forall a. HasCallStack => String -> a
    panic String
    "getTupleDataConName: impossible"

    {-
    Note [Uniques for wired-in prelude things and known tags]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Allocation of unique supply characters:
            v,u: for renumbering value-, and usage- vars.
            B:   builtin
            C-E: pseudo uniques     (used in native-code generator)
            I:   GHCi evaluation
            X:   uniques from mkLocalUnique
            _:   unifiable tyvars   (above)
            0-9: prelude things below
                 (no numbers left any more..)
            ::   (prelude) parallel array data constructors

            other a-z: lower case chars for unique supplies.  Used so far:

            a       TypeChecking?
            b       Boxing tycons & datacons
            c       StgToCmm/Renamer
            d       desugarer
            f       AbsC flattener
            i       TypeChecking interface files
            j       constraint tuple superclass selectors
            k       constraint tuple tycons
            m       constraint tuple datacons
            n       Native/LLVM codegen
            r       Hsc name cache
            s       simplifier
            u       Cmm pipeline
            y       GHCi bytecode generator
            z       anonymous sums

    Note [Related uniques for wired-in things]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    * All wired in tycons actually use *two* uniques:
      * u: the TyCon itself
      * u+1: the TyConRepName of the TyCon (for use with TypeRep)
      The "+1" is implemented in tyConRepNameUnique.
      If this ever changes, make sure to also change the treatment for boxing tycons.

    * All wired in datacons use *three* uniques:
      * u: the DataCon itself
      * u+1: its worker Id
      * u+2: the TyConRepName of the promoted TyCon
      No wired-in datacons have wrappers.
      The "+1" is implemented in dataConWorkerUnique and the "+2" is in dataConTyRepNameUnique.
      If this ever changes, make sure to also change the treatment for boxing tycons.

    * Because boxing tycons (see Note [Boxing constructors] in GHC.Builtin.Types)
      come with both a tycon and a datacon, each one takes up five slots, combining
      the two cases above. Getting from the tycon to the datacon (by adding 2)
      is implemented in boxingDataConUnique.
    -}

    mkAlphaTyVarUnique     :: Int -> Unique
    mkPreludeClassUnique   :: Int -> Unique
    mkPrimOpIdUnique       :: Int -> Unique
    -- See Note [Primop wrappers] in GHC.Builtin.PrimOps.
    mkPrimOpWrapperUnique  :: Int -> Unique
    mkPreludeMiscIdUnique  :: Int -> Unique

    mkAlphaTyVarUnique :: Int -> Unique
    mkAlphaTyVarUnique   Int
    i = Char -> Int -> Unique
    mkUniqueInt Char
    '1' Int
    i
    mkPreludeClassUnique :: Int -> Unique
    mkPreludeClassUnique Int
    i = Char -> Int -> Unique
    mkUniqueInt Char
    '2' Int
    i

    --------------------------------------------------
    mkPrimOpIdUnique :: Int -> Unique
    mkPrimOpIdUnique Int
    op         = Char -> Int -> Unique
    mkUniqueInt Char
    '9' (Int
    2Int -> Int -> Int
    forall a. Num a => a -> a -> a
    *Int
    op)
    mkPrimOpWrapperUnique :: Int -> Unique
    mkPrimOpWrapperUnique Int
    op    = Char -> Int -> Unique
    mkUniqueInt Char
    '9' (Int
    2Int -> Int -> Int
    forall a. Num a => a -> a -> a
    *Int
    opInt -> Int -> Int
    forall a. Num a => a -> a -> a
    +Int
    1)
    mkPreludeMiscIdUnique :: Int -> Unique
    mkPreludeMiscIdUnique  Int
    i    = Char -> Int -> Unique
    mkUniqueInt Char
    '0' Int
    i

    mkPseudoUniqueE, mkBuiltinUnique :: Int -> Unique

    mkBuiltinUnique :: Int -> Unique
    mkBuiltinUnique Int
    i = Char -> Int -> Unique
    mkUniqueInt Char
    'B' Int
    i
    mkPseudoUniqueE :: Int -> Unique
    mkPseudoUniqueE Int
    i = Char -> Int -> Unique
    mkUniqueInt Char
    'E' Int
    i -- used in NCG spiller to create spill VirtualRegs

    mkRegSingleUnique, mkRegPairUnique, mkRegSubUnique, mkRegClassUnique :: Int -> Unique
    mkRegSingleUnique :: Int -> Unique
    mkRegSingleUnique = Char -> Int -> Unique
    mkUniqueInt Char
    'R'
    mkRegSubUnique :: Int -> Unique
    mkRegSubUnique    = Char -> Int -> Unique
    mkUniqueInt Char
    'S'
    mkRegPairUnique :: Int -> Unique
    mkRegPairUnique   = Char -> Int -> Unique
    mkUniqueInt Char
    'P'
    mkRegClassUnique :: Int -> Unique
    mkRegClassUnique  = Char -> Int -> Unique
    mkUniqueInt Char
    'L'

    mkCostCentreUnique :: Int -> Unique
    mkCostCentreUnique :: Int -> Unique
    mkCostCentreUnique = Char -> Int -> Unique
    mkUniqueInt Char
    'C'

    varNSUnique, dataNSUnique, tvNSUnique, tcNSUnique :: Unique
    varNSUnique :: Unique
    varNSUnique    = Char -> Word64 -> Unique
    mkUnique Char
    'i' Word64
    0
    dataNSUnique :: Unique
    dataNSUnique   = Char -> Word64 -> Unique
    mkUnique Char
    'd' Word64
    0
    tvNSUnique :: Unique
    tvNSUnique     = Char -> Word64 -> Unique
    mkUnique Char
    'v' Word64
    0
    tcNSUnique :: Unique
    tcNSUnique     = Char -> Word64 -> Unique
    mkUnique Char
    'c' Word64
    0

    mkFldNSUnique :: FastString -> Unique
    mkFldNSUnique :: FastString -> Unique
    mkFldNSUnique FastString
    fs = Char -> Int -> Unique
    mkUniqueInt Char
    'f' (FastString -> Int
    uniqueOfFS FastString
    fs)

    isFldNSUnique :: Unique -> Bool
    isFldNSUnique :: Unique -> Bool
    isFldNSUnique Unique
    uniq = case Unique -> (Char, Word64)
    unpkUnique Unique
    uniq of
      (Char
    tag, Word64
    _) -> Char
    tag Char -> Char -> Bool
    forall a. Eq a => a -> a -> Bool
    == Char
    'f'

    initExitJoinUnique :: Unique
    initExitJoinUnique :: Unique
    initExitJoinUnique = Char -> Word64 -> Unique
    mkUnique Char
    's' Word64
    0

    --------------------------------------------------
    -- Wired-in type constructor keys occupy *two* slots:
    -- See Note [Related uniques for wired-in things]

    mkPreludeTyConUnique   :: Int -> Unique
    mkPreludeTyConUnique :: Int -> Unique
    mkPreludeTyConUnique Int
    i = Char -> Int -> Unique
    mkUniqueInt Char
    '3' (Int
    2Int -> Int -> Int
    forall a. Num a => a -> a -> a
    *Int
    i)

    tyConRepNameUnique :: Unique -> Unique
    tyConRepNameUnique :: Unique -> Unique
    tyConRepNameUnique  Unique
    u = Unique -> Unique
    incrUnique Unique
    u

    --------------------------------------------------
    -- Wired-in data constructor keys occupy *three* slots:
    -- See Note [Related uniques for wired-in things]

    mkPreludeDataConUnique :: Int -> Unique
    mkPreludeDataConUnique :: Int -> Unique
    mkPreludeDataConUnique Int
    i = Char -> Int -> Unique
    mkUniqueInt Char
    '6' (Int
    3Int -> Int -> Int
    forall a. Num a => a -> a -> a
    *Int
    i)    -- Must be alphabetic

    dataConTyRepNameUnique, dataConWorkerUnique :: Unique -> Unique
    dataConWorkerUnique :: Unique -> Unique
    dataConWorkerUnique  Unique
    u = Unique -> Unique
    incrUnique Unique
    u
    dataConTyRepNameUnique :: Unique -> Unique
    dataConTyRepNameUnique Unique
    u = Unique -> Word64 -> Unique
    stepUnique Unique
    u Word64
    2

    --------------------------------------------------
    -- The data constructors of RuntimeRep occupy *five* slots:
    -- See Note [Related uniques for wired-in things]
    --
    --    Example: WordRep
    --
    -- * u: the TyCon of the boxing data type WordBox
    -- * u+1: the TyConRepName of the boxing data type
    -- * u+2: the DataCon for MkWordBox
    -- * u+3: the worker id for MkWordBox
    -- * u+4: the TyConRepName of the promoted TyCon 'MkWordBox
    --
    -- Note carefully that
    -- * u,u+1 are in sync with the conventions for
    --          wired-in type constructors, above
    -- * u+2,u+3,u+4 are in sync with the conventions for
    --               wired-in data constructors, above
    -- A little delicate!

    mkBoxingTyConUnique :: Int -> Unique
    mkBoxingTyConUnique :: Int -> Unique
    mkBoxingTyConUnique Int
    i = Char -> Int -> Unique
    mkUniqueInt Char
    'b' (Int
    5Int -> Int -> Int
    forall a. Num a => a -> a -> a
    *Int
    i)

    boxingDataConUnique :: Unique -> Unique
    boxingDataConUnique :: Unique -> Unique
    boxingDataConUnique Unique
    u = Unique -> Word64 -> Unique
    stepUnique Unique
    u Word64
    2