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Return Unit manually in callSuspend and callSuspendBy if callable

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returns Unit. The reason is the same as in the previous commit.
If the callable is tail-call and its callee returns something other that
Unit and suspends, on resume the result of the call will not be Unit.
 #KT-34703
This commit is contained in:
Ilmir Usmanov
2019-11-01 02:30:02 +03:00
parent 04441da095
commit ca527444cb
1 changed files with 19 additions and 5 deletions
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core/reflection.jvm/src/kotlin/reflect/full/KCallables.kt
+19 -5
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@@ -7,9 +7,11 @@
package kotlin.reflect.full
import kotlin.coroutines.intrinsics.suspendCoroutineUninterceptedOrReturn
import kotlin.coroutines.Continuation
import kotlin.reflect.*
import kotlin.reflect.jvm.internal.*
import kotlin.reflect.KCallable
import kotlin.reflect.KFunction
import kotlin.reflect.KParameter
import kotlin.reflect.jvm.internal.KotlinReflectionInternalError
import kotlin.reflect.jvm.internal.asKCallableImpl
/**
* Returns a parameter representing the `this` instance needed to call this callable,
@@ -50,7 +52,13 @@ fun KCallable<*>.findParameterByName(name: String): KParameter? {
suspend fun <R> KCallable<R>.callSuspend(vararg args: Any?): R {
if (!this.isSuspend) return call(*args)
if (this !is KFunction<*>) throw IllegalArgumentException("Cannot callSuspend on a property $this: suspend properties are not supported yet")
return suspendCoroutineUninterceptedOrReturn { call(*args, it) }
val result = suspendCoroutineUninterceptedOrReturn<R> { call(*args, it) }
// If suspend function returns Unit and tail-call, it might appear, that it returns not Unit,
// see comment above replaceReturnsUnitMarkersWithPushingUnitOnStack for explanation.
// In this case, return Unit manually.
@Suppress("UNCHECKED_CAST")
if (returnType.classifier == Unit::class && !returnType.isMarkedNullable) return (Unit as R)
return result
}
/**
@@ -62,5 +70,11 @@ suspend fun <R> KCallable<R>.callSuspendBy(args: Map<KParameter, Any?>): R {
if (!this.isSuspend) return callBy(args)
if (this !is KFunction<*>) throw IllegalArgumentException("Cannot callSuspendBy on a property $this: suspend properties are not supported yet")
val kCallable = asKCallableImpl() ?: throw KotlinReflectionInternalError("This callable does not support a default call: $this")
return suspendCoroutineUninterceptedOrReturn<R> { kCallable.callDefaultMethod(args, it) }
val result = suspendCoroutineUninterceptedOrReturn<R> { kCallable.callDefaultMethod(args, it) }
// If suspend function returns Unit and tail-call, it might appear, that it returns not Unit,
// see comment above replaceReturnsUnitMarkersWithPushingUnitOnStack for explanation.
// In this case, return Unit manually.
@Suppress("UNCHECKED_CAST")
if (returnType.classifier == Unit::class && !returnType.isMarkedNullable) return (Unit as R)
return result
}