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Wasm wasi #4064
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31 changes: 31 additions & 0 deletions
31
kotlinx-coroutines-core/jsAndWasmShared/src/CoroutineContext.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| package kotlinx.coroutines | ||
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| import kotlinx.coroutines.internal.ScopeCoroutine | ||
| import kotlin.coroutines.* | ||
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| @PublishedApi // Used from kotlinx-coroutines-test via suppress, not part of ABI | ||
| internal actual val DefaultDelay: Delay | ||
| get() = Dispatchers.Default as Delay | ||
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| public actual fun CoroutineScope.newCoroutineContext(context: CoroutineContext): CoroutineContext { | ||
| val combined = coroutineContext + context | ||
| return if (combined !== Dispatchers.Default && combined[ContinuationInterceptor] == null) | ||
| combined + Dispatchers.Default else combined | ||
| } | ||
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| public actual fun CoroutineContext.newCoroutineContext(addedContext: CoroutineContext): CoroutineContext { | ||
| return this + addedContext | ||
| } | ||
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| // No debugging facilities on Wasm and JS | ||
| internal actual inline fun <T> withCoroutineContext(context: CoroutineContext, countOrElement: Any?, block: () -> T): T = block() | ||
| internal actual inline fun <T> withContinuationContext(continuation: Continuation<*>, countOrElement: Any?, block: () -> T): T = block() | ||
| internal actual fun Continuation<*>.toDebugString(): String = toString() | ||
| internal actual val CoroutineContext.coroutineName: String? get() = null // not supported on Wasm and JS | ||
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| internal actual class UndispatchedCoroutine<in T> actual constructor( | ||
| context: CoroutineContext, | ||
| uCont: Continuation<T> | ||
| ) : ScopeCoroutine<T>(context, uCont) { | ||
| override fun afterResume(state: Any?) = uCont.resumeWith(recoverResult(state, uCont)) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| package kotlinx.coroutines | ||
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| internal actual val DEBUG: Boolean = false | ||
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| internal actual val Any.hexAddress: String | ||
| get() = this.hashCode().toString() | ||
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| internal actual val Any.classSimpleName: String get() = this::class.simpleName ?: "Unknown" | ||
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| internal actual inline fun assert(value: () -> Boolean) {} |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
| @file:OptIn(UnsafeWasmMemoryApi::class) | ||
| package kotlinx.coroutines | ||
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| import kotlin.coroutines.CoroutineContext | ||
| import kotlin.wasm.* | ||
| import kotlin.wasm.unsafe.* | ||
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| @WasmImport("wasi_snapshot_preview1", "poll_oneoff") | ||
| private external fun wasiPollOneOff(ptrToSubscription: Int, eventPtr: Int, nsubscriptions: Int, resultPtr: Int): Int | ||
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| @WasmImport("wasi_snapshot_preview1", "clock_time_get") | ||
| private external fun wasiRawClockTimeGet(clockId: Int, precision: Long, resultPtr: Int): Int | ||
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| private const val CLOCKID_MONOTONIC = 1 | ||
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| internal actual fun createEventLoop(): EventLoop = DefaultExecutor | ||
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| internal actual fun nanoTime(): Long = withScopedMemoryAllocator { allocator: MemoryAllocator -> | ||
| val ptrTo8Bytes = allocator.allocate(8) | ||
| val returnCode = wasiRawClockTimeGet( | ||
| clockId = CLOCKID_MONOTONIC, | ||
| precision = 1, | ||
| resultPtr = ptrTo8Bytes.address.toInt() | ||
| ) | ||
| check(returnCode == 0) { "clock_time_get failed with the return code $returnCode" } | ||
| ptrTo8Bytes.loadLong() | ||
| } | ||
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| private fun sleep(nanos: Long, ptrTo32Bytes: Pointer, ptrTo8Bytes: Pointer, ptrToSubscription: Pointer) { | ||
| //__wasi_timestamp_t timeout; | ||
| (ptrToSubscription + 24).storeLong(nanos) | ||
| val returnCode = wasiPollOneOff( | ||
| ptrToSubscription = ptrToSubscription.address.toInt(), | ||
| eventPtr = ptrTo32Bytes.address.toInt(), | ||
| nsubscriptions = 1, | ||
| resultPtr = ptrTo8Bytes.address.toInt() | ||
| ) | ||
| check(returnCode == 0) { "poll_oneoff failed with the return code $returnCode" } | ||
| } | ||
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| internal actual object DefaultExecutor : EventLoopImplBase() { | ||
| override fun shutdown() { | ||
| // don't do anything: on WASI, the event loop is the default executor, we can't shut it down | ||
| } | ||
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| override fun invokeOnTimeout(timeMillis: Long, block: Runnable, context: CoroutineContext): DisposableHandle = | ||
| scheduleInvokeOnTimeout(timeMillis, block) | ||
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| actual override fun enqueue(task: Runnable) { | ||
| if (kotlin.wasm.internal.onExportedFunctionExit == null) { | ||
| kotlin.wasm.internal.onExportedFunctionExit = ::runEventLoop | ||
| } | ||
| super.enqueue(task) | ||
| } | ||
| } | ||
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| internal actual abstract class EventLoopImplPlatform : EventLoop() { | ||
| protected actual fun unpark() { | ||
| // do nothing: in WASI, no external callbacks can be invoked while `poll_oneoff` is running, | ||
| // so it is both impossible and unnecessary to unpark the event loop | ||
| } | ||
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| protected actual fun reschedule(now: Long, delayedTask: EventLoopImplBase.DelayedTask) { | ||
| // throw; on WASI, the event loop is the default executor, we can't shut it down or reschedule tasks | ||
| // to anyone else | ||
| throw UnsupportedOperationException("runBlocking event loop is not supported") | ||
| } | ||
| } | ||
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| internal actual inline fun platformAutoreleasePool(crossinline block: () -> Unit) = block() | ||
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| internal fun runEventLoop() { | ||
| withScopedMemoryAllocator { allocator -> | ||
| val ptrToSubscription = initializeSubscriptionPtr(allocator) | ||
| val ptrTo32Bytes = allocator.allocate(32) | ||
| val ptrTo8Bytes = allocator.allocate(8) | ||
| val eventLoop = DefaultExecutor | ||
| eventLoop.incrementUseCount() | ||
| try { | ||
| while (true) { | ||
| val parkNanos = eventLoop.processNextEvent() | ||
| if (parkNanos == Long.MAX_VALUE) { | ||
| // no more events | ||
| break | ||
| } | ||
| if (parkNanos > 0) { | ||
| // sleep until the next event | ||
| sleep( | ||
| parkNanos, | ||
| ptrTo32Bytes = ptrTo32Bytes, | ||
| ptrTo8Bytes = ptrTo8Bytes, | ||
| ptrToSubscription = ptrToSubscription | ||
| ) | ||
| } | ||
| } | ||
| } finally { // paranoia | ||
| eventLoop.decrementUseCount() | ||
| } | ||
| } | ||
| } | ||
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| private fun initializeSubscriptionPtr(allocator: MemoryAllocator): Pointer { | ||
| val ptrToSubscription = allocator.allocate(48) | ||
| //userdata | ||
| ptrToSubscription.storeLong(0) | ||
| //uint8_t tag; | ||
| (ptrToSubscription + 8).storeByte(0) //EVENTTYPE_CLOCK | ||
| //__wasi_clockid_t id; | ||
| (ptrToSubscription + 16).storeInt(CLOCKID_MONOTONIC) //CLOCKID_MONOTONIC | ||
| //__wasi_timestamp_t timeout; | ||
| //(ptrToSubscription + 24).storeLong(timeout) | ||
| //__wasi_timestamp_t precision; | ||
| (ptrToSubscription + 32).storeLong(0) | ||
| //__wasi_subclockflags_t | ||
| (ptrToSubscription + 40).storeShort(0) //ABSOLUTE_TIME=1/RELATIVE=0 | ||
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| return ptrToSubscription | ||
| } | ||
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| internal actual fun createDefaultDispatcher(): CoroutineDispatcher = DefaultExecutor |
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Unfortunately we can't do this in
configure-compilation-conventions.gradle.ktsbecause there is no way to distingishWasmWasitarget fromWasmJsorJStargets there.