ghc-9.4.0.20220721: The GHC API
Safe HaskellSafe-Inferred
LanguageHaskell2010

GHC.Types.Id

Description

GHC uses several kinds of name internally:

Synopsis

The main types

data Var Source #

Variable

Essentially a typed Name, that may also contain some additional information about the Var and its use sites.

Instances

Instances details
Data Var Source # 
Instance details

Defined in GHC.Types.Var

Methods

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

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

toConstr :: Var -> Constr Source #

dataTypeOf :: Var -> DataType Source #

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

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

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

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

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

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

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

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

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

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

NamedThing Var Source # 
Instance details

Defined in GHC.Types.Var

HasOccName Var Source # 
Instance details

Defined in GHC.Types.Var

Methods

occName :: Var -> OccName Source #

Uniquable Var Source # 
Instance details

Defined in GHC.Types.Var

Methods

getUnique :: Var -> Unique Source #

Outputable Var Source # 
Instance details

Defined in GHC.Types.Var

Methods

ppr :: Var -> SDoc Source #

OutputableBndr Var Source # 
Instance details

Defined in GHC.Core.Ppr

Eq Var Source # 
Instance details

Defined in GHC.Types.Var

Methods

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

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

Ord Var Source # 
Instance details

Defined in GHC.Types.Var

Methods

compare :: Var -> Var -> Ordering #

(<) :: Var -> Var -> Bool #

(<=) :: Var -> Var -> Bool #

(>) :: Var -> Var -> Bool #

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

max :: Var -> Var -> Var #

min :: Var -> Var -> Var #

Eq (DeBruijn CoreAlt) Source # 
Instance details

Defined in GHC.Core.Map.Expr

Eq (DeBruijn CoreExpr) Source # 
Instance details

Defined in GHC.Core.Map.Expr

Eq (DeBruijn Var) Source # 
Instance details

Defined in GHC.Core.Map.Type

OutputableBndr (Id, TagSig) Source # 
Instance details

Defined in GHC.Stg.InferTags.TagSig

type Anno Id Source # 
Instance details

Defined in GHC.Hs.Extension

type Anno (LocatedN Id) Source # 
Instance details

Defined in GHC.Hs.Binds

type Anno [LocatedN Id] Source # 
Instance details

Defined in GHC.Hs.Binds

type Id = Var Source #

Identifier

isId :: Var -> Bool Source #

Is this a value-level (i.e., computationally relevant) Varentifier? Satisfies isId = not . isTyVar.

In and Out variants

type InVar = Var Source #

type InId = Id Source #

type OutId = Id Source #

Simple construction

mkGlobalId :: IdDetails -> Name -> Type -> IdInfo -> Id Source #

For an explanation of global vs. local Ids, see GHC.Types.Var.Var

mkVanillaGlobal :: Name -> Type -> Id Source #

Make a global Id without any extra information at all

mkVanillaGlobalWithInfo :: Name -> Type -> IdInfo -> Id Source #

Make a global Id with no global information but some generic IdInfo

mkLocalId :: HasDebugCallStack => Name -> Mult -> Type -> Id Source #

For an explanation of global vs. local Ids, see GHC.Types.Var

mkLocalCoVar :: Name -> Type -> CoVar Source #

Make a local CoVar

mkLocalIdOrCoVar :: Name -> Mult -> Type -> Id Source #

Like mkLocalId, but checks the type to see if it should make a covar

mkExportedLocalId :: IdDetails -> Name -> Type -> Id Source #

Create a local Id that is marked as exported. This prevents things attached to it from being removed as dead code. See Note [Exported LocalIds]

mkSysLocal :: FastString -> Unique -> Mult -> Type -> Id Source #

Create a system local Id. These are local Ids (see Var) that are created by the compiler out of thin air

mkSysLocalOrCoVar :: FastString -> Unique -> Mult -> Type -> Id Source #

Like mkSysLocal, but checks to see if we have a covar type

mkUserLocal :: OccName -> Unique -> Mult -> Type -> SrcSpan -> Id Source #

Create a user local Id. These are local Ids (see GHC.Types.Var) with a name and location that the user might recognize

mkUserLocalOrCoVar :: OccName -> Unique -> Mult -> Type -> SrcSpan -> Id Source #

Like mkUserLocal, but checks if we have a coercion type

mkTemplateLocals :: [Type] -> [Id] Source #

Create a template local for a series of types

mkTemplateLocalsNum :: Int -> [Type] -> [Id] Source #

Create a template local for a series of type, but start from a specified template local

mkTemplateLocal :: Int -> Type -> Id Source #

Create a template local: a family of system local Ids in bijection with Ints, typically used in unfoldings

mkWorkerId :: Unique -> Id -> Type -> Id Source #

Workers get local names. CoreTidy will externalise these if necessary

Taking an Id apart

recordSelectorTyCon :: Id -> RecSelParent Source #

If the Id is that for a record selector, extract the sel_tycon. Panic otherwise.

Modifying an Id

setIdType :: Id -> Type -> Id Source #

Not only does this set the Id Type, it also evaluates the type to try and reduce space usage

updateIdTypeAndMultM :: Monad m => (Type -> m Type) -> Id -> m Id Source #

globaliseId :: Id -> Id Source #

If it's a local, make it global

scaleVarBy :: Mult -> Var -> Var Source #

Like scaleIdBy, but skips non-Ids. Useful for scaling a mixed list of ids and tyvars.

Predicates on Ids

isImplicitId :: Id -> Bool Source #

isImplicitId tells whether an Ids info is implied by other declarations, so we don't need to put its signature in an interface file, even if it's mentioned in some other interface unfolding.

isStrictId :: Id -> Bool Source #

This predicate says whether the Id has a strict demand placed on it or has a type such that it can always be evaluated strictly (i.e an unlifted type, as of GHC 7.6). We need to check separately whether the Id has a so-called "strict type" because if the demand for the given id hasn't been computed yet but id has a strict type, we still want isStrictId id to be True.

isExportedId :: Var -> Bool Source #

isExportedIdVar means "don't throw this away"

idDataCon :: Id -> DataCon Source #

Get from either the worker or the wrapper Id to the DataCon. Currently used only in the desugarer.

INVARIANT: idDataCon (dataConWrapId d) = d: remember, dataConWrapId can return either the wrapper or the worker

isWorkerLikeId :: Id -> Bool Source #

An Id for which we might require all callers to pass strict arguments properly tagged + evaluated.

See Note [CBV Function Ids]

isDeadEndId :: Var -> Bool Source #

Returns true if an application to n args diverges or throws an exception See Note [Dead ends] in GHC.Types.Demand.

hasNoBinding :: Id -> Bool Source #

Returns True of an Id which may not have a binding, even though it is defined in this module.

Join variables

type JoinId = Id Source #

isJoinId_maybe :: Var -> Maybe JoinArity Source #

Doesn't return strictness marks

asJoinId :: Id -> JoinArity -> JoinId infixl 1 Source #

Inline pragma stuff

One-shot lambdas

isOneShotBndr :: Var -> Bool Source #

Returns whether the lambda associated with the Id is certainly applied at most once This one is the "business end", called externally. It works on type variables as well as Ids, returning True Its main purpose is to encapsulate the Horrible State Hack See Note [The state-transformer hack] in GHC.Core.Opt.Arity

stateHackOneShot :: OneShotInfo Source #

Should we apply the state hack to values of this Type?

Reading IdInfo fields

idUnfolding :: Id -> Unfolding Source #

Returns the Ids unfolding, but does not expose the unfolding of a strong loop breaker. See unfoldingInfo.

If you really want the unfolding of a strong loopbreaker, call realIdUnfolding.

realIdUnfolding :: Id -> Unfolding Source #

Expose the unfolding if there is one, including for loop breakers

idCafInfo :: Id -> CafInfo infixl 1 Source #

idStateHackOneShotInfo :: Id -> OneShotInfo Source #

Like idOneShotInfo, but taking the Horrible State Hack in to account See Note [The state-transformer hack] in GHC.Core.Opt.Arity

Writing IdInfo fields

setIdUnfolding :: Id -> Unfolding -> Id infixl 1 Source #

zapIdUnfolding :: Id -> Id Source #

Similar to trimUnfolding, but also removes evaldness info.

setIdArity :: Id -> Arity -> Id infixl 1 Source #

setIdCallArity :: Id -> Arity -> Id infixl 1 Source #

setIdOccInfo :: Id -> OccInfo -> Id infixl 1 Source #

setIdDemandInfo :: Id -> Demand -> Id infixl 1 Source #

setIdDmdSig :: Id -> DmdSig -> Id infixl 1 Source #

setIdCprSig :: Id -> CprSig -> Id infixl 1 Source #

setIdCbvMarks :: Id -> [CbvMark] -> Id infixl 1 Source #

If all marks are NotMarkedStrict we just set nothing.

asWorkerLikeId :: Id -> Id Source #

Turn this id into a WorkerLikeId if possible.

asNonWorkerLikeId :: Id -> Id Source #

Remove any cbv marks on arguments from a given Id.

idDmdSig :: Id -> DmdSig Source #

Accesses the Id's dmdSigInfo.