| Safe Haskell | None |
|---|---|
| Language | Haskell2010 |
GHC.Exts.Heap.Closures
Synopsis
- type Closure = GenClosure Box
- data GenClosure b
- = ConstrClosure { }
- | FunClosure {
- info :: !StgInfoTable
- ptrArgs :: ![b]
- dataArgs :: ![Word]
- | ThunkClosure {
- info :: !StgInfoTable
- ptrArgs :: ![b]
- dataArgs :: ![Word]
- | SelectorClosure {
- info :: !StgInfoTable
- selectee :: !b
- | PAPClosure { }
- | APClosure { }
- | APStackClosure {
- info :: !StgInfoTable
- fun :: !b
- payload :: ![b]
- | IndClosure {
- info :: !StgInfoTable
- indirectee :: !b
- | BCOClosure { }
- | BlackholeClosure {
- info :: !StgInfoTable
- indirectee :: !b
- | ArrWordsClosure { }
- | MutArrClosure {
- info :: !StgInfoTable
- mccPtrs :: !Word
- mccSize :: !Word
- mccPayload :: ![b]
- | MVarClosure {
- info :: !StgInfoTable
- queueHead :: !b
- queueTail :: !b
- value :: !b
- | MutVarClosure {
- info :: !StgInfoTable
- var :: !b
- | BlockingQueueClosure { }
- | IntClosure { }
- | WordClosure { }
- | Int64Closure { }
- | Word64Closure { }
- | AddrClosure { }
- | FloatClosure { }
- | DoubleClosure { }
- | OtherClosure {
- info :: !StgInfoTable
- hvalues :: ![b]
- rawWords :: ![Word]
- | UnsupportedClosure {
- info :: !StgInfoTable
- data PrimType
- allClosures :: GenClosure b -> [b]
- data Box = Box Any
- areBoxesEqual :: Box -> Box -> IO Bool
- asBox :: a -> Box
Closures
type Closure = GenClosure Box Source #
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 |
| 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
| |
| BlackholeClosure | A thunk under evaluation by another thread |
Fields
| |
| ArrWordsClosure | A |
| MutArrClosure | A |
Fields
| |
| MVarClosure | An |
Fields
| |
| MutVarClosure | A |
Fields
| |
| BlockingQueueClosure | An STM blocking queue. |
| IntClosure | Primitive Int |
| WordClosure | Primitive Word |
| Int64Closure | Primitive Int64 |
| Word64Closure | Primitive Word64 |
| AddrClosure | Primitive Addr |
| FloatClosure | Primitive Float |
| DoubleClosure | Primitive Double |
| OtherClosure | Another kind of closure |
Fields
| |
| UnsupportedClosure | |
Fields
| |
Instances
Instances
| Eq PrimType # | |
| Show PrimType # | |
| Generic PrimType # | |
| type Rep PrimType # | |
Defined in GHC.Exts.Heap.Closures type Rep PrimType = D1 ('MetaData "PrimType" "GHC.Exts.Heap.Closures" "ghc-heap-8.8.0.20190613" '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
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.