ghc-lib-0.20190204: The GHC API, decoupled from GHC versions

Safe HaskellNone
LanguageHaskell2010

GHC.Exts.Heap.Closures

Contents

Synopsis

Closures

data GenClosure b Source #

This is the representation of a Haskell value on the heap. It reflects http://ghc.haskell.org/trac/ghc/browser/includes/rts/storage/Closures.h

The data type is parametrized by the type to store references in. Usually this is a Box with the type synonym Closure.

All Heap objects have the same basic layout. A header containing a pointer to the info table and a payload with various fields. The info field below always refers to the info table pointed to by the header. The remaining fields are the payload.

See https://ghc.haskell.org/trac/ghc/wiki/Commentary/Rts/Storage/HeapObjects for more information.

Constructors

ConstrClosure

A data constructor

Fields

FunClosure

A function

Fields

ThunkClosure

A thunk, an expression not obviously in head normal form

Fields

SelectorClosure

A thunk which performs a simple selection operation

Fields

PAPClosure

An unsaturated function application

Fields

APClosure

A function application

Fields

APStackClosure

A suspended thunk evaluation

Fields

IndClosure

A pointer to another closure, introduced when a thunk is updated to point at its value

Fields

BCOClosure

A byte-code object (BCO) which can be interpreted by GHC's byte-code interpreter (e.g. as used by GHCi)

Fields

  • info :: !StgInfoTable
     
  • instrs :: !b

    A pointer to an ArrWords of instructions

  • literals :: !b

    A pointer to an ArrWords of literals

  • bcoptrs :: !b

    A pointer to an ArrWords of byte code objects

  • arity :: !HalfWord

    Arity of the partial application

  • size :: !HalfWord

    The size of this BCO in words

  • bitmap :: ![Word]

    An StgLargeBitmap describing the pointerhood of its args/free vars

BlackholeClosure

A thunk under evaluation by another thread

Fields

ArrWordsClosure

A ByteArray#

Fields

MutArrClosure

A MutableByteArray#

Fields

MVarClosure

An MVar#, with a queue of thread state objects blocking on them

Fields

MutVarClosure

A MutVar#

Fields

BlockingQueueClosure

An STM blocking queue.

Fields

IntClosure

Primitive Int

Fields

WordClosure

Primitive Word

Fields

Int64Closure

Primitive Int64

Fields

Word64Closure

Primitive Word64

Fields

AddrClosure

Primitive Addr

Fields

FloatClosure

Primitive Float

Fields

DoubleClosure

Primitive Double

Fields

OtherClosure

Another kind of closure

Fields

UnsupportedClosure 

Fields

Instances
Functor GenClosure Source # 
Instance details

Defined in GHC.Exts.Heap.Closures

Methods

fmap :: (a -> b) -> GenClosure a -> GenClosure b #

(<$) :: a -> GenClosure b -> GenClosure a #

Foldable GenClosure Source # 
Instance details

Defined in GHC.Exts.Heap.Closures

Methods

fold :: Monoid m => GenClosure m -> m #

foldMap :: Monoid m => (a -> m) -> GenClosure a -> m #

foldr :: (a -> b -> b) -> b -> GenClosure a -> b #

foldr' :: (a -> b -> b) -> b -> GenClosure a -> b #

foldl :: (b -> a -> b) -> b -> GenClosure a -> b #

foldl' :: (b -> a -> b) -> b -> GenClosure a -> b #

foldr1 :: (a -> a -> a) -> GenClosure a -> a #

foldl1 :: (a -> a -> a) -> GenClosure a -> a #

toList :: GenClosure a -> [a] #

null :: GenClosure a -> Bool #

length :: GenClosure a -> Int #

elem :: Eq a => a -> GenClosure a -> Bool #

maximum :: Ord a => GenClosure a -> a #

minimum :: Ord a => GenClosure a -> a #

sum :: Num a => GenClosure a -> a #

product :: Num a => GenClosure a -> a #

Traversable GenClosure Source # 
Instance details

Defined in GHC.Exts.Heap.Closures

Methods

traverse :: Applicative f => (a -> f b) -> GenClosure a -> f (GenClosure b) #

sequenceA :: Applicative f => GenClosure (f a) -> f (GenClosure a) #

mapM :: Monad m => (a -> m b) -> GenClosure a -> m (GenClosure b) #

sequence :: Monad m => GenClosure (m a) -> m (GenClosure a) #

Show b => Show (GenClosure b) Source # 
Instance details

Defined in GHC.Exts.Heap.Closures

Generic (GenClosure b) Source # 
Instance details

Defined in GHC.Exts.Heap.Closures

Associated Types

type Rep (GenClosure b) :: Type -> Type #

Methods

from :: GenClosure b -> Rep (GenClosure b) x #

to :: Rep (GenClosure b) x -> GenClosure b #

Binary a => Binary (GenClosure a) Source # 
Instance details

Defined in GHCi.Message

Methods

put :: GenClosure a -> Put #

get :: Get (GenClosure a) #

putList :: [GenClosure a] -> Put #

type Rep (GenClosure b) Source # 
Instance details

Defined in GHC.Exts.Heap.Closures

type Rep (GenClosure b) = D1 (MetaData "GenClosure" "GHC.Exts.Heap.Closures" "ghc-lib-0.20190204-8PmsVmG6Lfq3uCuHOLppjw" False) ((((C1 (MetaCons "ConstrClosure" PrefixI True) ((S1 (MetaSel (Just "info") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 StgInfoTable) :*: (S1 (MetaSel (Just "ptrArgs") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 [b]) :*: S1 (MetaSel (Just "dataArgs") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 [Word]))) :*: (S1 (MetaSel (Just "pkg") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 String) :*: (S1 (MetaSel (Just "modl") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 String) :*: S1 (MetaSel (Just "name") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 String)))) :+: (C1 (MetaCons "FunClosure" PrefixI True) (S1 (MetaSel (Just "info") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 StgInfoTable) :*: (S1 (MetaSel (Just "ptrArgs") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 [b]) :*: S1 (MetaSel (Just "dataArgs") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 [Word]))) :+: C1 (MetaCons "ThunkClosure" PrefixI True) (S1 (MetaSel (Just "info") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 StgInfoTable) :*: (S1 (MetaSel (Just "ptrArgs") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 [b]) :*: S1 (MetaSel (Just "dataArgs") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 [Word]))))) :+: (C1 (MetaCons "SelectorClosure" PrefixI True) (S1 (MetaSel (Just "info") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 StgInfoTable) :*: S1 (MetaSel (Just "selectee") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 b)) :+: (C1 (MetaCons "PAPClosure" PrefixI True) ((S1 (MetaSel (Just "info") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 StgInfoTable) :*: S1 (MetaSel (Just "arity") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 HalfWord)) :*: (S1 (MetaSel (Just "n_args") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 HalfWord) :*: (S1 (MetaSel (Just "fun") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 b) :*: S1 (MetaSel (Just "payload") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 [b])))) :+: C1 (MetaCons "APClosure" PrefixI True) ((S1 (MetaSel (Just "info") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 StgInfoTable) :*: S1 (MetaSel (Just "arity") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 HalfWord)) :*: (S1 (MetaSel (Just "n_args") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 HalfWord) :*: (S1 (MetaSel (Just "fun") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 b) :*: S1 (MetaSel (Just "payload") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 [b]))))))) :+: ((C1 (MetaCons "APStackClosure" PrefixI True) (S1 (MetaSel (Just "info") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 StgInfoTable) :*: (S1 (MetaSel (Just "fun") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 b) :*: S1 (MetaSel (Just "payload") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 [b]))) :+: (C1 (MetaCons "IndClosure" PrefixI True) (S1 (MetaSel (Just "info") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 StgInfoTable) :*: S1 (MetaSel (Just "indirectee") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 b)) :+: C1 (MetaCons "BCOClosure" PrefixI True) ((S1 (MetaSel (Just "info") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 StgInfoTable) :*: (S1 (MetaSel (Just "instrs") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 b) :*: S1 (MetaSel (Just "literals") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 b))) :*: ((S1 (MetaSel (Just "bcoptrs") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 b) :*: S1 (MetaSel (Just "arity") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 HalfWord)) :*: (S1 (MetaSel (Just "size") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 HalfWord) :*: S1 (MetaSel (Just "bitmap") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 [Word])))))) :+: (C1 (MetaCons "BlackholeClosure" PrefixI True) (S1 (MetaSel (Just "info") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 StgInfoTable) :*: S1 (MetaSel (Just "indirectee") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 b)) :+: (C1 (MetaCons "ArrWordsClosure" PrefixI True) (S1 (MetaSel (Just "info") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 StgInfoTable) :*: (S1 (MetaSel (Just "bytes") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Word) :*: S1 (MetaSel (Just "arrWords") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 [Word]))) :+: C1 (MetaCons "MutArrClosure" PrefixI True) ((S1 (MetaSel (Just "info") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 StgInfoTable) :*: S1 (MetaSel (Just "mccPtrs") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Word)) :*: (S1 (MetaSel (Just "mccSize") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Word) :*: S1 (MetaSel (Just "mccPayload") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 [b]))))))) :+: (((C1 (MetaCons "MVarClosure" PrefixI True) ((S1 (MetaSel (Just "info") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 StgInfoTable) :*: S1 (MetaSel (Just "queueHead") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 b)) :*: (S1 (MetaSel (Just "queueTail") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 b) :*: S1 (MetaSel (Just "value") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 b))) :+: (C1 (MetaCons "MutVarClosure" PrefixI True) (S1 (MetaSel (Just "info") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 StgInfoTable) :*: S1 (MetaSel (Just "var") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 b)) :+: C1 (MetaCons "BlockingQueueClosure" PrefixI True) ((S1 (MetaSel (Just "info") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 StgInfoTable) :*: S1 (MetaSel (Just "link") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 b)) :*: (S1 (MetaSel (Just "blackHole") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 b) :*: (S1 (MetaSel (Just "owner") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 b) :*: S1 (MetaSel (Just "queue") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 b)))))) :+: (C1 (MetaCons "IntClosure" PrefixI True) (S1 (MetaSel (Just "ptipe") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 PrimType) :*: S1 (MetaSel (Just "intVal") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Int)) :+: (C1 (MetaCons "WordClosure" PrefixI True) (S1 (MetaSel (Just "ptipe") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 PrimType) :*: S1 (MetaSel (Just "wordVal") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Word)) :+: C1 (MetaCons "Int64Closure" PrefixI True) (S1 (MetaSel (Just "ptipe") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 PrimType) :*: S1 (MetaSel (Just "int64Val") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Int64))))) :+: ((C1 (MetaCons "Word64Closure" PrefixI True) (S1 (MetaSel (Just "ptipe") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 PrimType) :*: S1 (MetaSel (Just "word64Val") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Word64)) :+: (C1 (MetaCons "AddrClosure" PrefixI True) (S1 (MetaSel (Just "ptipe") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 PrimType) :*: S1 (MetaSel (Just "addrVal") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Int)) :+: C1 (MetaCons "FloatClosure" PrefixI True) (S1 (MetaSel (Just "ptipe") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 PrimType) :*: S1 (MetaSel (Just "floatVal") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Float)))) :+: (C1 (MetaCons "DoubleClosure" PrefixI True) (S1 (MetaSel (Just "ptipe") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 PrimType) :*: S1 (MetaSel (Just "doubleVal") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Double)) :+: (C1 (MetaCons "OtherClosure" PrefixI True) (S1 (MetaSel (Just "info") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 StgInfoTable) :*: (S1 (MetaSel (Just "hvalues") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 [b]) :*: S1 (MetaSel (Just "rawWords") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 [Word]))) :+: C1 (MetaCons "UnsupportedClosure" PrefixI True) (S1 (MetaSel (Just "info") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 StgInfoTable)))))))

data PrimType Source #

Instances
Eq PrimType Source # 
Instance details

Defined in GHC.Exts.Heap.Closures

Show PrimType Source # 
Instance details

Defined in GHC.Exts.Heap.Closures

Generic PrimType Source # 
Instance details

Defined in GHC.Exts.Heap.Closures

Associated Types

type Rep PrimType :: Type -> Type #

Methods

from :: PrimType -> Rep PrimType x #

to :: Rep PrimType x -> PrimType #

Binary PrimType Source # 
Instance details

Defined in GHCi.Message

Methods

put :: PrimType -> Put #

get :: Get PrimType #

putList :: [PrimType] -> Put #

type Rep PrimType Source # 
Instance details

Defined in GHC.Exts.Heap.Closures

type Rep PrimType = D1 (MetaData "PrimType" "GHC.Exts.Heap.Closures" "ghc-lib-0.20190204-8PmsVmG6Lfq3uCuHOLppjw" False) ((C1 (MetaCons "PInt" PrefixI False) (U1 :: Type -> Type) :+: (C1 (MetaCons "PWord" PrefixI False) (U1 :: Type -> Type) :+: C1 (MetaCons "PInt64" PrefixI False) (U1 :: Type -> Type))) :+: ((C1 (MetaCons "PWord64" PrefixI False) (U1 :: Type -> Type) :+: C1 (MetaCons "PAddr" PrefixI False) (U1 :: Type -> Type)) :+: (C1 (MetaCons "PFloat" PrefixI False) (U1 :: Type -> Type) :+: C1 (MetaCons "PDouble" PrefixI False) (U1 :: Type -> Type))))

allClosures :: GenClosure b -> [b] Source #

For generic code, this function returns all referenced closures.

Boxes

data Box Source #

An arbitrary Haskell value in a safe Box. The point is that even unevaluated thunks can safely be moved around inside the Box, and when required, e.g. in getBoxedClosureData, the function knows how far it has to evaluate the argument.

Constructors

Box Any 
Instances
Show Box Source # 
Instance details

Defined in GHC.Exts.Heap.Closures

Methods

showsPrec :: Int -> Box -> ShowS #

show :: Box -> String #

showList :: [Box] -> ShowS #

areBoxesEqual :: Box -> Box -> IO Bool Source #

Boxes can be compared, but this is not pure, as different heap objects can, after garbage collection, become the same object.

asBox :: a -> Box Source #

This takes an arbitrary value and puts it into a box. Note that calls like

asBox (head list)

will put the thunk "head list" into the box, not the element at the head of the list. For that, use careful case expressions:

case list of x:_ -> asBox x