RepType

Code generator views onto Types

type UnaryType = Type

type NvUnaryType = Type

isNvUnaryType :: Type -> Bool

unwrapType :: Type -> Type

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

isVoidTy :: Type -> Bool

True if the type has zero width.

Type representation for the code generator

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

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 -> PrimRep

Like typePrimRep, but assumes that there is precisely 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 -> Type -> [PrimRep]

Take a type of kind RuntimeRep and extract the list of PrimRep that it encodes. See also Note [Getting from RuntimeRep to PrimRep]

typePrimRepArgs :: HasDebugCallStack => Type -> [PrimRep]

data PrimRep

A PrimRep is an abstraction of a type. 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 RepType and Note [VoidRep] in RepType.

Constructors

VoidRep

LiftedRep

UnliftedRep

Unlifted pointer

Int8Rep

Signed, 8-bit value

Int16Rep

Signed, 16-bit value

Int32Rep

Signed, 32-bit value

Int64Rep

Signed, 64 bit value (with 32-bit words only)

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 (with 32-bit words only)

WordRep

Unsigned, word-sized value

AddrRep

A pointer, but not to a Haskell value (use '(Un)liftedRep')

FloatRep

DoubleRep

VecRep Int PrimElemRep

A vector

Instances

Show PrimRep

Defined in TyCon

Methods

showsPrec :: Int -> PrimRep -> ShowS

show :: PrimRep -> String

showList :: [PrimRep] -> ShowS

Outputable PrimRep

Defined in TyCon

Methods

ppr :: PrimRep -> SDoc

pprPrec :: Rational -> PrimRep -> SDoc

primRepToType :: PrimRep -> Type

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

countConRepArgs :: DataCon -> RepArity

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

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]

tyConPrimRep1 :: HasDebugCallStack => TyCon -> PrimRep

Like tyConPrimRep, but assumed that there is precisely zero or one PrimRep output See also Note [Getting from RuntimeRep to PrimRep] and Note [VoidRep]

Unboxed sum representation type

ubxSumRepType :: [[PrimRep]] -> [SlotTy]

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

E.g.

( | Maybe 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 :: SortedSlotTys -> [SlotTy] -> [Int]

typeSlotTy :: UnaryType -> Maybe SlotTy

data SlotTy

Constructors

PtrSlot

WordSlot

Word64Slot

FloatSlot

DoubleSlot

Instances

Eq SlotTy

Defined in RepType

Methods

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

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

Ord SlotTy

Defined in RepType

Methods

compare :: SlotTy -> SlotTy -> Ordering

(<) :: SlotTy -> SlotTy -> Bool

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

(>) :: SlotTy -> SlotTy -> Bool

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

max :: SlotTy -> SlotTy -> SlotTy

min :: SlotTy -> SlotTy -> SlotTy

Outputable SlotTy

Defined in RepType

Methods

ppr :: SlotTy -> SDoc

pprPrec :: Rational -> SlotTy -> SDoc

slotPrimRep :: SlotTy -> PrimRep

primRepSlot :: PrimRep -> SlotTy