mirror of
https://github.com/idris-lang/Idris2.git
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108 lines
2.8 KiB
Idris
108 lines
2.8 KiB
Idris
module PrimIO
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import Builtin
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%default total
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public export
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data IORes : Type -> Type where
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MkIORes : (result : a) -> (1 x : %World) -> IORes a
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||| Idris's primitive IO, for building abstractions on top of.
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public export
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PrimIO : Type -> Type
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PrimIO a = (1 x : %World) -> IORes a
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||| The internal representation of I/O computations.
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export
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data IO : Type -> Type where
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MkIO : (1 fn : PrimIO a) -> IO a
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export
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prim__io_pure : a -> PrimIO a
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prim__io_pure = MkIORes
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%inline
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export
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io_pure : a -> IO a
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io_pure x = MkIO (MkIORes x)
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export
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prim__io_bind : (1 act : PrimIO a) -> (1 k : a -> PrimIO b) -> PrimIO b
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prim__io_bind fn k w
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= let MkIORes x' w' = fn w in k x' w'
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-- There's a special case for inlining this is Compiler.Inline, because
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-- the inliner is cautious about case blocks at the moment. Once it's less
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-- cautious, add an explicit %inline directive and take out the special case.
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-- See also dealing with the newtype optimisation via %World in
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-- Compiler.CompileExpr
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export
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io_bind : (1 act : IO a) -> (1 k : a -> IO b) -> IO b
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io_bind (MkIO fn) k
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= MkIO (\w => let MkIORes x' w' = fn w
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MkIO res = k x' in
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res w')
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-- A pointer representing a given parameter type
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-- The parameter is a phantom type, to help differentiate between
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-- different pointer types
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public export
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data Ptr : Type -> Type where [external]
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-- A pointer to any type (representing a void* in foreign calls)
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public export
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data AnyPtr : Type where [external]
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-- As Ptr, but associated with a finaliser that is run on garbage collection
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public export
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data GCPtr : Type -> Type where [external]
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-- As AnyPtr, but associated with a finaliser that is run on garbage collection
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public export
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data GCAnyPtr : Type where [external]
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public export
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data ThreadID : Type where [external]
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export %inline
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fromPrim : (1 fn : (1 x : %World) -> IORes a) -> IO a
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fromPrim op = MkIO op
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export %inline
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toPrim : (1 act : IO a) -> PrimIO a
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toPrim (MkIO fn) = fn
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%foreign "C:idris2_isNull, libidris2_support, idris_support.h"
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"javascript:lambda:x=>x===undefined||x===null?1:0"
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export
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prim__nullAnyPtr : AnyPtr -> Int
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%foreign "C:idris2_getNull, libidris2_support, idris_support.h"
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export
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prim__getNullAnyPtr : AnyPtr
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export
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prim__castPtr : AnyPtr -> Ptr t
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prim__castPtr = believe_me
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export
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prim__forgetPtr : Ptr t -> AnyPtr
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prim__forgetPtr = believe_me
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export %inline
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prim__nullPtr : Ptr t -> Int -- can't pass 'type' to a foreign function
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prim__nullPtr p = prim__nullAnyPtr (prim__forgetPtr p)
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unsafeCreateWorld : (1 f : (1 x : %World) -> a) -> a
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unsafeCreateWorld f = f %MkWorld
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unsafeDestroyWorld : (1 x : %World) -> a -> a
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unsafeDestroyWorld %MkWorld x = x
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export
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unsafePerformIO : IO a -> a
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unsafePerformIO (MkIO f)
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= unsafeCreateWorld (\w => case f w of
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MkIORes res w' => unsafeDestroyWorld w' res)
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