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Enable safe recursion with trampoline #54

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45ef556
cold tasks only
majocha Aug 23, 2025
428a7cb
some cleanup
majocha Aug 23, 2025
4294dc3
vibe code more tests
majocha Aug 23, 2025
c2cdd07
cleanup
majocha Aug 24, 2025
fa5473c
currently broken mut rec
majocha Aug 27, 2025
74bf071
mut rec tests do pass now
majocha Aug 28, 2025
e72d11d
check just once for each task and use it both ways
majocha Aug 28, 2025
dbcd50f
fix nasty bug - stale ref to wrong instance
majocha Aug 28, 2025
019ec44
restore check on each possible yield
majocha Sep 1, 2025
0a0c85f
bindLimit 100
majocha Sep 1, 2025
7ac5b55
missed this one
majocha Sep 3, 2025
cff23a1
format
majocha Sep 3, 2025
ae56870
Merge branch 'master' into trampoline
majocha Sep 28, 2025
e3d2023
Merge remote-tracking branch 'origin/master' into trampoline
majocha Nov 30, 2025
39cd1ca
update
majocha Dec 1, 2025
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126 changes: 82 additions & 44 deletions src/IcedTasks/CancellablePoolingValueTask.fs
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Original file line number Diff line number Diff line change
Expand Up @@ -54,35 +54,59 @@ module CancellablePoolingValueTasks =
let initialResumptionFunc =
CancellableTaskBaseResumptionFunc<'T, _>(fun sm -> code.Invoke(&sm))

let resumptionInfo =
let resumptionInfo () =
let mutable state = InitialYield

{ new CancellableTaskBaseResumptionDynamicInfo<'T, _>(initialResumptionFunc) with
member info.MoveNext(sm) =
let mutable savedExn = null

try
sm.ResumptionDynamicInfo.ResumptionData <- null
let step = info.ResumptionFunc.Invoke(&sm)

if step then
MethodBuilder.SetResult(&sm.Data.MethodBuilder, sm.Data.Result)
else
match sm.ResumptionDynamicInfo.ResumptionData with
| :? ICriticalNotifyCompletion as awaiter ->
let mutable awaiter = awaiter
// assert not (isNull awaiter)
MethodBuilder.AwaitOnCompleted(
&sm.Data.MethodBuilder,
&awaiter,
&sm
)
| awaiter -> assert not (isNull awaiter)

with exn ->
savedExn <- exn
// Run SetException outside the stack unwind, see https://github.com/dotnet/roslyn/issues/26567
match savedExn with
| null -> ()
| exn -> MethodBuilder.SetException(&sm.Data.MethodBuilder, exn)
let current = state
let mutable continuation = Stop

match current with
| InitialYield ->
state <- Running

continuation <-
if BindContext.CheckWhenIsBind() then Bounce else Immediate
| Running ->
try
let step = info.ResumptionFunc.Invoke(&sm)

if step then
state <- SetResult

continuation <-
if BindContext.Check() then Bounce else Immediate
else
continuation <-
Await(downcast sm.ResumptionDynamicInfo.ResumptionData)
with exn ->
state <- SetException(ExceptionCache.CaptureOrRetrieve exn)
continuation <- if BindContext.Check() then Bounce else Immediate
| SetResult ->
MethodBuilder.SetResult(&sm.Data.MethodBuilder, sm.Data.Result)
| SetException edi ->
MethodBuilder.SetException(&sm.Data.MethodBuilder, edi.SourceException)

let continuation = continuation

match continuation with
| Stop -> ()
| Immediate -> info.MoveNext(&sm)
| Bounce ->
MethodBuilder.AwaitOnCompleted(
&sm.Data.MethodBuilder,
Trampoline.AwaiterRef,
&sm
)
| Await awaiter ->
let mutable awaiter = awaiter

MethodBuilder.AwaitUnsafeOnCompleted(
&sm.Data.MethodBuilder,
&awaiter,
&sm
)

member _.SetStateMachine(sm, state) =
MethodBuilder.SetStateMachine(&sm.Data.MethodBuilder, state)
Expand All @@ -93,7 +117,7 @@ module CancellablePoolingValueTasks =
ValueTask.FromCanceled<_>(ct)
else
sm.Data.CancellationToken <- ct
sm.ResumptionDynamicInfo <- resumptionInfo
sm.ResumptionDynamicInfo <- resumptionInfo ()
sm.Data.MethodBuilder <- PoolingAsyncValueTaskMethodBuilder<'T>.Create()
sm.Data.MethodBuilder.Start(&sm)
sm.Data.MethodBuilder.Task
Expand All @@ -103,22 +127,36 @@ module CancellablePoolingValueTasks =
if __useResumableCode then
__stateMachine<CancellableTaskBaseStateMachineData<'T, _>, CancellableValueTask<'T>>
(MoveNextMethodImpl<_>(fun sm ->
//-- RESUMABLE CODE START
__resumeAt sm.ResumptionPoint
let mutable __stack_exn = null

try
let __stack_code_fin = code.Invoke(&sm)

if __stack_code_fin then
MethodBuilder.SetResult(&sm.Data.MethodBuilder, sm.Data.Result)
with exn ->
__stack_exn <- exn
// Run SetException outside the stack unwind, see https://github.com/dotnet/roslyn/issues/26567
match __stack_exn with
| null -> ()
| exn -> MethodBuilder.SetException(&sm.Data.MethodBuilder, exn)
//-- RESUMABLE CODE END
let mutable error = ValueNone

let __stack_go1 = yieldOnBindLimitWhenIsBind().Invoke(&sm)

if __stack_go1 then
try
let __stack_code_fin = code.Invoke(&sm)

if __stack_code_fin then
let __stack_go2 = yieldOnBindLimit().Invoke(&sm)

if __stack_go2 then
MethodBuilder.SetResult(
&sm.Data.MethodBuilder,
sm.Data.Result
)
with exn ->
error <-
ValueSome
<| ExceptionCache.CaptureOrRetrieve exn

if error.IsSome then
let __stack_go2 = yieldOnBindLimit().Invoke(&sm)

if __stack_go2 then
MethodBuilder.SetException(
&sm.Data.MethodBuilder,
error.Value.SourceException
)
))
(SetStateMachineMethodImpl<_>(fun sm state ->
MethodBuilder.SetStateMachine(&sm.Data.MethodBuilder, state)
Expand Down Expand Up @@ -148,7 +186,7 @@ module CancellablePoolingValueTasks =
([<InlineIfLambda>] x: CancellationToken -> ValueTask<_>)
: CancellationToken -> Awaiter<ValueTaskAwaiter<_>, _> =
fun ct ->
(x ct)
BindContext.SetIsBind x ct
|> Awaitable.GetAwaiter

[<NoEagerConstraintApplication>]
Expand Down
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