-- | 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