ghc-7.10.3: The GHC API

Safe Haskell | None
Language | Haskell2010

Name

Contents

- The main types
  - Creating `Name`s
  - Manipulating and deconstructing `Name`s
  - Predicates on `Name`s
- Class `NamedThing` and overloaded friends

Description

GHC uses several kinds of name internally:

- `OccName`: see OccName
- `RdrName`: see RdrName
- `Name` is the type of names that have had their scoping and binding resolved. They have an `OccName` but also a `Unique` that disambiguates Names that have the same `OccName` and indeed is used for all `Name` comparison. Names also contain information about where they originated from, see Name
- `Id`: see Id
- `Var`: see Var

Names are one of:

- External, if they name things declared in other modules. Some external Names are wired in, i.e. they name primitives defined in the compiler itself
- Internal, if they name things in the module being compiled. Some internal Names are system names, if they are names manufactured by the compiler

Synopsis

- data Name
- data BuiltInSyntax
  - = BuiltInSyntax
  - | UserSyntax
- mkSystemName :: Unique -> OccName -> Name
- mkSystemNameAt :: Unique -> OccName -> SrcSpan -> Name
- mkInternalName :: Unique -> OccName -> SrcSpan -> Name
- mkClonedInternalName :: Unique -> Name -> Name
- mkDerivedInternalName :: (OccName -> OccName) -> Unique -> Name -> Name
- mkSystemVarName :: Unique -> FastString -> Name
- mkSysTvName :: Unique -> FastString -> Name
- mkFCallName :: Unique -> String -> Name
- mkExternalName :: Unique -> Module -> OccName -> SrcSpan -> Name
- mkWiredInName :: Module -> OccName -> Unique -> TyThing -> BuiltInSyntax -> Name
- nameUnique :: Name -> Unique
- setNameUnique :: Name -> Unique -> Name
- nameOccName :: Name -> OccName
- nameModule :: Name -> Module
- nameModule_maybe :: Name -> Maybe Module
- setNameLoc :: Name -> SrcSpan -> Name
- tidyNameOcc :: Name -> OccName -> Name
- localiseName :: Name -> Name
- mkLocalisedOccName :: Module -> (Maybe String -> OccName -> OccName) -> Name -> OccName
- nameSrcLoc :: Name -> SrcLoc
- nameSrcSpan :: Name -> SrcSpan
- pprNameDefnLoc :: Name -> SDoc
- pprDefinedAt :: Name -> SDoc
- isSystemName :: Name -> Bool
- isInternalName :: Name -> Bool
- isExternalName :: Name -> Bool
- isTyVarName :: Name -> Bool
- isTyConName :: Name -> Bool
- isDataConName :: Name -> Bool
- isValName :: Name -> Bool
- isVarName :: Name -> Bool
- isWiredInName :: Name -> Bool
- isBuiltInSyntax :: Name -> Bool
- wiredInNameTyThing_maybe :: Name -> Maybe TyThing
- nameIsLocalOrFrom :: Module -> Name -> Bool
- stableNameCmp :: Name -> Name -> Ordering
- class NamedThing a where
  - getOccName :: a -> OccName
  - getName :: a -> Name
- getSrcLoc :: NamedThing a => a -> SrcLoc
- getSrcSpan :: NamedThing a => a -> SrcSpan
- getOccString :: NamedThing a => a -> String
- pprInfixName :: (Outputable a, NamedThing a) => a -> SDoc
- pprPrefixName :: (Outputable a, NamedThing a) => a -> SDoc
- pprModulePrefix :: PprStyle -> Module -> OccName -> SDoc
- module OccName

# The main types

data Name

A unique, unambigious name for something, containing information about where that thing originated.

Instances

Eq Name |
Data Name |
Ord Name |
OutputableBndr Name |
Outputable Name |
Uniquable Name |
Binary Name |
HasOccName Name |
NamedThing Name |
type PostRn Name ty = ty |
type PostTc Name ty = PlaceHolder |

data BuiltInSyntax

BuiltInSyntax is for things like `(:)`, `[]` and tuples, which have special syntactic forms. They aren't in scope as such.

Constructors

BuiltInSyntax |
UserSyntax |

## Creating `Name`s

mkSystemName :: Unique -> OccName -> Name

Create a name brought into being by the compiler

mkSystemNameAt :: Unique -> OccName -> SrcSpan -> Name

mkInternalName :: Unique -> OccName -> SrcSpan -> Name

Create a name which is (for now at least) local to the current module and hence does not need a `Module` to disambiguate it from other `Name`s

mkClonedInternalName :: Unique -> Name -> Name

mkDerivedInternalName :: (OccName -> OccName) -> Unique -> Name -> Name

mkSystemVarName :: Unique -> FastString -> Name

mkSysTvName :: Unique -> FastString -> Name

mkFCallName :: Unique -> String -> Name

Make a name for a foreign call

mkExternalName :: Unique -> Module -> OccName -> SrcSpan -> Name

Create a name which definitely originates in the given module

mkWiredInName :: Module -> OccName -> Unique -> TyThing -> BuiltInSyntax -> Name

Create a name which is actually defined by the compiler itself

## Manipulating and deconstructing `Name`s

nameUnique :: Name -> Unique

setNameUnique :: Name -> Unique -> Name

nameOccName :: Name -> OccName

nameModule :: Name -> Module

nameModule_maybe :: Name -> Maybe Module

setNameLoc :: Name -> SrcSpan -> Name

tidyNameOcc :: Name -> OccName -> Name

localiseName :: Name -> Name

Make the `Name` into an internal name, regardless of what it was to begin with

mkLocalisedOccName :: Module -> (Maybe String -> OccName -> OccName) -> Name -> OccName

Create a localised variant of a name.

If the name is external, encode the original's module name to disambiguate. SPJ says: this looks like a rather odd-looking function; but it seems to be used only during vectorisation, so I'm not going to worry

nameSrcLoc :: Name -> SrcLoc

nameSrcSpan :: Name -> SrcSpan

pprNameDefnLoc :: Name -> SDoc

pprDefinedAt :: Name -> SDoc

## Predicates on `Name`s

isSystemName :: Name -> Bool

isInternalName :: Name -> Bool

isExternalName :: Name -> Bool

isTyVarName :: Name -> Bool

isTyConName :: Name -> Bool

isDataConName :: Name -> Bool

isValName :: Name -> Bool

isVarName :: Name -> Bool

isWiredInName :: Name -> Bool

isBuiltInSyntax :: Name -> Bool

wiredInNameTyThing_maybe :: Name -> Maybe TyThing

nameIsLocalOrFrom :: Module -> Name -> Bool

Returns True if the name is (a) Internal (b) External but from the specified module (c) External but from the `interactive` package

The key idea is that False means: the entity is defined in some other module you can find the details (type, fixity, instances) in some interface file those details will be stored in the EPT or HPT

True means: the entity is defined in this module or earlier in the GHCi session you can find details (type, fixity, instances) in the TcGblEnv or TcLclEnv

The isInteractiveModule part is because successive interactions of a GCHi session each give rise to a fresh module (Ghci1, Ghci2, etc), but they all come from the magic `interactive` package; and all the details are kept in the TcLclEnv, TcGblEnv, NOT in the HPT or EPT. See Note [The interactive package] in HscTypes

stableNameCmp :: Name -> Name -> Ordering

# Class `NamedThing` and overloaded friends

class NamedThing a where

A class allowing convenient access to the `Name` of various datatypes

Minimal complete definition

getName

Methods

getOccName :: a -> OccName

getName :: a -> Name

Instances

NamedThing Name |
NamedThing TyThing |
NamedThing TyCon |
NamedThing DataCon |
NamedThing PatSyn |
NamedThing ConLike |
NamedThing Var |
NamedThing Class |
NamedThing ClsInst |
NamedThing FamInst |
NamedThing TcSigInfo |
NamedThing (CoAxiom br) |

getSrcLoc :: NamedThing a => a -> SrcLoc

getSrcSpan :: NamedThing a => a -> SrcSpan

getOccString :: NamedThing a => a -> String

pprInfixName :: (Outputable a, NamedThing a) => a -> SDoc

pprPrefixName :: (Outputable a, NamedThing a) => a -> SDoc

pprModulePrefix :: PprStyle -> Module -> OccName -> SDoc

module OccName