ghc-9.12: The GHC API
Safe HaskellNone
LanguageGHC2021

GHC.Types.RepType

Synopsis

Code generator views onto Types

unwrapType :: Type -> Type Source #

Gets rid of the stuff that prevents us from understanding the runtime representation of a type. Including: 1. Casts 2. Newtypes 3. Foralls 4. Synonyms But not type/data families, because we don't have the envs to hand.

Predicates on types

isZeroBitTy :: HasDebugCallStack => Type -> Bool Source #

True if the type has zero width.

Type representation for the code generator

typePrimRep :: HasDebugCallStack => Type -> [PrimRep] Source #

Discovers the primitive representation of a Type. Returns a list of PrimRep: it's a list because of the possibility of no runtime representation (void) or multiple (unboxed tuple/sum) See also Note [Getting from RuntimeRep to PrimRep]

typePrimRep1 :: HasDebugCallStack => UnaryType -> PrimOrVoidRep Source #

Like typePrimRep, but assumes that there is at most one PrimRep output; an empty list of PrimReps becomes a VoidRep. This assumption holds after unarise, see Note [Post-unarisation invariants]. Before unarise it may or may not hold. See also Note [RuntimeRep and PrimRep] and Note [VoidRep]

runtimeRepPrimRep :: HasDebugCallStack => SDoc -> RuntimeRepType -> [PrimRep] Source #

Take a type of kind RuntimeRep and extract the list of PrimRep that it encodes. See also Note [Getting from RuntimeRep to PrimRep]. The [PrimRep] is the final runtime representation after unarisation.

data PrimRep Source #

A PrimRep is an abstraction of a non-void type. (Use PrimRepOrVoidRep if you want void types too.) It contains information that the code generator needs in order to pass arguments, return results, and store values of this type. See also Note [RuntimeRep and PrimRep] in GHC.Types.RepType and Note [VoidRep] in GHC.Types.RepType.

Constructors

BoxedRep !(Maybe Levity)

Boxed, heap value

Int8Rep

Signed, 8-bit value

Int16Rep

Signed, 16-bit value

Int32Rep

Signed, 32-bit value

Int64Rep

Signed, 64 bit value

IntRep

Signed, word-sized value

Word8Rep

Unsigned, 8 bit value

Word16Rep

Unsigned, 16 bit value

Word32Rep

Unsigned, 32 bit value

Word64Rep

Unsigned, 64 bit value

WordRep

Unsigned, word-sized value

AddrRep

A pointer, but not to a Haskell value (use BoxedRep)

FloatRep 
DoubleRep 
VecRep Int PrimElemRep

A vector

Instances

Instances details
Binary PrimRep Source # 
Instance details

Defined in GHC.Core.TyCon

Outputable PrimRep Source # 
Instance details

Defined in GHC.Core.TyCon

Methods

ppr :: PrimRep -> SDoc Source #

Data PrimRep Source # 
Instance details

Defined in GHC.Core.TyCon

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> PrimRep -> c PrimRep #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c PrimRep #

toConstr :: PrimRep -> Constr #

dataTypeOf :: PrimRep -> DataType #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c PrimRep) #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c PrimRep) #

gmapT :: (forall b. Data b => b -> b) -> PrimRep -> PrimRep #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> PrimRep -> r #

gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> PrimRep -> r #

gmapQ :: (forall d. Data d => d -> u) -> PrimRep -> [u] #

gmapQi :: Int -> (forall d. Data d => d -> u) -> PrimRep -> u #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> PrimRep -> m PrimRep #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> PrimRep -> m PrimRep #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> PrimRep -> m PrimRep #

Show PrimRep Source # 
Instance details

Defined in GHC.Core.TyCon

Eq PrimRep Source # 
Instance details

Defined in GHC.Core.TyCon

Methods

(==) :: PrimRep -> PrimRep -> Bool #

(/=) :: PrimRep -> PrimRep -> Bool #

Ord PrimRep Source # 
Instance details

Defined in GHC.Core.TyCon

primRepToRuntimeRep :: PrimRep -> RuntimeRepType Source #

Convert a PrimRep to a Type of kind RuntimeRep

primRepToType :: PrimRep -> Type Source #

Convert a PrimRep back to a Type. Used only in the unariser to give types to fresh Ids. Really, only the type's representation matters. See also Note [RuntimeRep and PrimRep]

countFunRepArgs :: Arity -> Type -> RepArity Source #

Count the arity of a function post-unarisation, including zero-width arguments.

The post-unarisation arity may be larger than the arity of the original function type. See Note [Unarisation].

dataConRuntimeRepStrictness :: HasDebugCallStack => DataCon -> [StrictnessMark] Source #

Give the demands on the arguments of a Core constructor application (Con dc args) at runtime. Assumes the constructor is not levity polymorphic. For example unboxed tuples won't work.

tyConPrimRep :: HasDebugCallStack => TyCon -> [PrimRep] Source #

Find the runtime representation of a TyCon. Defined here to avoid module loops. Returns a list of the register shapes necessary. See also Note [Getting from RuntimeRep to PrimRep]

runtimeRepPrimRep_maybe :: Type -> Maybe [PrimRep] Source #

Take a type of kind RuntimeRep and extract the list of PrimRep that it encodes. See also Note [Getting from RuntimeRep to PrimRep]. The [PrimRep] is the final runtime representation after unarisation.

Returns Nothing if rep can't be determined. Eg. levity polymorphic types.

kindPrimRep_maybe :: HasDebugCallStack => Kind -> Maybe [PrimRep] Source #

Take a kind (of shape `TYPE rr` or `CONSTRAINT rr`) and produce the PrimReps of values of types of this kind. See also Note [Getting from RuntimeRep to PrimRep] Returns Nothing if rep can't be determined. Eg. levity polymorphic types.

typePrimRep_maybe :: Type -> Maybe [PrimRep] Source #

Discovers the primitive representation of a Type. Returns a list of PrimRep: it's a list because of the possibility of no runtime representation (void) or multiple (unboxed tuple/sum) See also Note [Getting from RuntimeRep to PrimRep] Returns Nothing if rep can't be determined. Eg. levity polymorphic types.

Unboxed sum representation type

ubxSumRepType :: [[PrimRep]] -> NonEmpty SlotTy Source #

Given the arguments of a sum type constructor application, return the unboxed sum rep type.

E.g.

(# Int# | Maybe Int | (# Int#, Float# #) #)

We call `ubxSumRepType [ [IntRep], [LiftedRep], [IntRep, FloatRep] ]`, which returns [WordSlot, PtrSlot, WordSlot, FloatSlot]

INVARIANT: Result slots are sorted (via Ord SlotTy), except that at the head of the list we have the slot for the tag.

layoutUbxSum :: HasDebugCallStack => SortedSlotTys -> [SlotTy] -> [Int] Source #

data SlotTy Source #

Instances

Instances details
Outputable SlotTy Source # 
Instance details

Defined in GHC.Types.RepType

Methods

ppr :: SlotTy -> SDoc Source #

Eq SlotTy Source # 
Instance details

Defined in GHC.Types.RepType

Methods

(==) :: SlotTy -> SlotTy -> Bool #

(/=) :: SlotTy -> SlotTy -> Bool #

Ord SlotTy Source # 
Instance details

Defined in GHC.Types.RepType

Is this type known to be data?