ghc-8.10.0.20191210: The GHC API
Safe HaskellNone
LanguageHaskell2010

OccName

Description

GHC uses several kinds of name internally:

  • OccName represents names as strings with just a little more information: the "namespace" that the name came from, e.g. the namespace of value, type constructors or data constructors
  • RdrName: see RdrName
  • Name: see Name
  • Id: see Id
  • Var: see Var
Synopsis

The NameSpace type

data NameSpace Source #

Instances

Instances details
Eq NameSpace # 
Instance details

Defined in OccName

Ord NameSpace # 
Instance details

Defined in OccName

Binary NameSpace # 
Instance details

Defined in OccName

Construction

There are two forms of data constructor:

Source data constructors
The data constructors mentioned in Haskell source code
Real data constructors
The data constructors of the representation type, which may not be the same as the source type

For example:

data T = T !(Int, Int)

The source datacon has type (Int, Int) -> T The real datacon has type Int -> Int -> T

GHC chooses a representation based on the strictness etc.

Pretty Printing

The OccName type

data OccName Source #

Occurrence Name

In this context that means: "classified (i.e. as a type name, value name, etc) but not qualified and not yet resolved"

Instances

Instances details
Eq OccName # 
Instance details

Defined in OccName

Methods

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

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

Data OccName # 
Instance details

Defined in OccName

Methods

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

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

toConstr :: OccName -> Constr Source #

dataTypeOf :: OccName -> DataType Source #

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

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

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

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

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

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

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

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

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

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

Ord OccName # 
Instance details

Defined in OccName

NFData OccName # 
Instance details

Defined in OccName

Methods

rnf :: OccName -> () Source #

OutputableBndr OccName # 
Instance details

Defined in OccName

Outputable OccName # 
Instance details

Defined in OccName

Uniquable OccName # 
Instance details

Defined in OccName

Binary OccName # 
Instance details

Defined in OccName

HasOccName OccName # 
Instance details

Defined in OccName

Construction

mkDFunOcc Source #

Arguments

:: String

Typically the class and type glommed together e.g. OrdMaybe. Only used in debug mode, for extra clarity

-> Bool

Is this a hs-boot instance DFun?

-> OccSet

avoid these Occs

-> OccName

E.g. $f3OrdMaybe

class HasOccName name where Source #

Other names in the compiler add additional information to an OccName. This class provides a consistent way to access the underlying OccName.

Methods

occName :: name -> OccName Source #

Instances

Instances details
HasOccName Name # 
Instance details

Defined in Name

Methods

occName :: Name -> OccName Source #

HasOccName OccName # 
Instance details

Defined in OccName

HasOccName Var # 
Instance details

Defined in Var

Methods

occName :: Var -> OccName Source #

HasOccName RdrName # 
Instance details

Defined in RdrName

HasOccName IfaceConDecl # 
Instance details

Defined in IfaceSyn

HasOccName IfaceClassOp # 
Instance details

Defined in IfaceSyn

HasOccName IfaceDecl # 
Instance details

Defined in IfaceSyn

HasOccName TcBinder # 
Instance details

Defined in TcRnTypes

HasOccName HoleFitCandidate # 
Instance details

Defined in TcHoleFitTypes

HasOccName name => HasOccName (IEWrappedName name) # 
Instance details

Defined in GHC.Hs.ImpExp

Derived OccNames

isDerivedOccName :: OccName -> Bool Source #

Test for definitions internally generated by GHC. This predicte is used to suppress printing of internal definitions in some debug prints

isTypeableBindOcc :: OccName -> Bool Source #

Is an OccName one of a Typeable TyCon or Module binding? This is needed as these bindings are renamed differently. See Note [Grand plan for Typeable] in TcTypeable.

mkDataTOcc Source #

Arguments

:: OccName

TyCon or data con string

-> OccSet

avoid these Occs

-> OccName

E.g. $f3OrdMaybe data T = MkT ... deriving( Data ) needs definitions for $tT :: Data.Generics.Basics.DataType $cMkT :: Data.Generics.Basics.Constr

mkDataCOcc Source #

Arguments

:: OccName

TyCon or data con string

-> OccSet

avoid these Occs

-> OccName

E.g. $f3OrdMaybe data T = MkT ... deriving( Data ) needs definitions for $tT :: Data.Generics.Basics.DataType $cMkT :: Data.Generics.Basics.Constr

mkSuperDictSelOcc Source #

Arguments

:: Int

Index of superclass, e.g. 3

-> OccName

Class, e.g. Ord

-> OccName

Derived Occname, e.g. $p3Ord

mkLocalOcc Source #

Arguments

:: Unique

Unique to combine with the OccName

-> OccName

Local name, e.g. sat

-> OccName

Nice unique version, e.g. $L23sat

mkInstTyTcOcc Source #

Arguments

:: String

Family name, e.g. Map

-> OccSet

avoid these Occs

-> OccName
R:Map

Derive a name for the representation type constructor of a data/newtype instance.

Deconstruction

isDataSymOcc :: OccName -> Bool Source #

Test if the OccName is a data constructor that starts with a symbol (e.g. :, or [])

isSymOcc :: OccName -> Bool Source #

Test if the OccName is that for any operator (whether it is a data constructor or variable or whatever)

isValOcc :: OccName -> Bool Source #

Value OccNamess are those that are either in the variable or data constructor namespaces

parenSymOcc :: OccName -> SDoc -> SDoc Source #

Wrap parens around an operator

startsWithUnderscore :: OccName -> Bool Source #

Haskell 98 encourages compilers to suppress warnings about unsed names in a pattern if they start with _: this implements that test

The OccEnv type

data OccEnv a Source #

Instances

Instances details
Data a => Data (OccEnv a) # 
Instance details

Defined in OccName

Methods

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

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

toConstr :: OccEnv a -> Constr Source #

dataTypeOf :: OccEnv a -> DataType Source #

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

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

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

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

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

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

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

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

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

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

Outputable a => Outputable (OccEnv a) # 
Instance details

Defined in OccName

Methods

ppr :: OccEnv a -> SDoc Source #

pprPrec :: Rational -> OccEnv a -> SDoc Source #

mapOccEnv :: (a -> b) -> OccEnv a -> OccEnv b Source #

mkOccEnv :: [(OccName, a)] -> OccEnv a Source #

mkOccEnv_C :: (a -> a -> a) -> [(OccName, a)] -> OccEnv a Source #

foldOccEnv :: (a -> b -> b) -> b -> OccEnv a -> b Source #

plusOccEnv_C :: (a -> a -> a) -> OccEnv a -> OccEnv a -> OccEnv a Source #

extendOccEnv_C :: (a -> a -> a) -> OccEnv a -> OccName -> a -> OccEnv a Source #

extendOccEnv_Acc :: (a -> b -> b) -> (a -> b) -> OccEnv b -> OccName -> a -> OccEnv b Source #

filterOccEnv :: (elt -> Bool) -> OccEnv elt -> OccEnv elt Source #

alterOccEnv :: (Maybe elt -> Maybe elt) -> OccEnv elt -> OccName -> OccEnv elt Source #

pprOccEnv :: (a -> SDoc) -> OccEnv a -> SDoc Source #

The OccSet type

Tidying up

type FastStringEnv a = UniqFM a Source #

A non-deterministic set of FastStrings. See Note [Deterministic UniqFM] in UniqDFM for explanation why it's not deterministic and why it matters. Use DFastStringEnv if the set eventually gets converted into a list or folded over in a way where the order changes the generated code.