ghc-8.4.0.20171214: The GHC API

Safe HaskellNone
LanguageHaskell2010

Id

Contents

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 it's use sites.

Instances
Eq Var # 
Instance details

Methods

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

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

Data Var # 
Instance details

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 :: (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 #

Ord Var # 
Instance details

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 #

Outputable Var # 
Instance details

Methods

ppr :: Var -> SDoc Source #

pprPrec :: Rational -> Var -> SDoc Source #

Uniquable Var # 
Instance details

Methods

getUnique :: Var -> Unique Source #

HasOccName Var # 
Instance details

Methods

occName :: Var -> OccName Source #

NamedThing Var # 
Instance details

type Id = Var Source #

Identifier

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 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 :: Name -> Type -> Id Source #

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

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

Make a local CoVar

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

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

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

Make a local id, with the IdDetails set to CoVarId if the type indicates so.

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 -> 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 -> Type -> Id Source #

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

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

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

mkUserLocalOrCoVar :: OccName -> Unique -> 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

globaliseId :: Id -> Id Source #

If it's a local, make it global

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

isBottomingId :: Var -> Bool Source #

Returns true if an application to n args would diverge

hasNoBinding :: Id -> Bool Source #

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

Evidence variables

type DictId = EvId Source #

Dictionary Identifier

Join variables

type JoinId = Id Source #

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 CoreArity

stateHackOneShot :: OneShotInfo Source #

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

Reading IdInfo fields

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 CoreArity

Writing IdInfo fields

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

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 #