Compilation failed: null with Kotlin 1.3.40

[jcraane]

We migrated our Kotlin multiplatform project from 1.3.21 to 1.3.40 (and updated all dependencies accordingly) and now we get the following error when compiling the common Kotlin code to IOS native:

> Task :common:linkDebugFrameworkIos
e: Compilation failed: null

e: kotlin.KotlinNullPointerException
	at org.jetbrains.kotlin.backend.konan.optimizations.ModuleDFGBuilder$FunctionDFGBuilder.getNode(DFGBuilder.kt:516)

There are lots of classes in our common code so it is not easy to determine what causes the error. Adding --info or --debug does not provide much more info.

Is there a preferred way of debugging these kind of issues? I can copy the code to a minimal project and then manually removing classes to see when it will work but this is quite tedious.

Thanks!

[homuroll]

Please try compile with option -Xdisable-phases=Devirtualization,BuildDFG or with gradle:

compilations.all {
    kotlinOptions {
        freeCompilerArgs += "-Xdisable-phases=Devirtualization,BuildDFG"
    }
}

and tell us if it helps or not.

[jcraane]

I am not sure where to put that configuration. I get a message compilations is an unknown property (in gradle). Apart from this I was able to localize this issue: The following construction does compile/run on the JVM but gives a NullPointerException when compiling to native:

import kotlinx.serialization.Serializable
import kotlinx.serialization.Transient

@Serializable
data class CachedItem(var data: String) {
    @Transient
    var timeProvider = RealtimeProvider()
    var creationTime = timeProvider.getNow()
}

class RealtimeProvider {
    fun getNow() = 100L
}

If I remove the dependency on the timeProvider in the initialization of the creationTime property, the code does compile.

I can workaround this issue but should this scenario be supported (it was working in 1.3.21)?

[homuroll]

Looks like a bug in the serialization plugin. @sandwwraith will look at it.

[NiKlimenko]

@jcraane seems you are trying to serialize the creationTime property which depends on timeProvider that you skipped for serialization.

[jcraane]

That is correct indeed. But serializing/deserializing works on the JVM in this case but the compilation phase to IOS/native code fails. This was working with kotlin 1.3.21. If I remove the @serializable, compilation to native code works (but than I cannot deserialize/serialize it from/to JSON of course).

[olonho]

This is an issue of https://github.com/Kotlin/kotlinx.serialization compiler plugin, so would be better to move discussing the problem there.

[webfrea-k]

@homuroll I've tried to add "-Xdisable-phases=Devirtualization,BuildDFG" as you suggested. The command leads to another error:

* Compiler version info: Konan: 1.3 / Kotlin: 1.3.40
 * Output kind: FRAMEWORK

e: java.lang.UnsupportedOperationException: org.jetbrains.kotlin.ir.declarations.impl.IrVariableImpl@4ab32a94

Hope this helps, otherwise I'll wait for the kotlinx.serialization fix.

[sandwwraith]

I can confirm that the problem is caused by creationTime dependent on timeProvider variable. Such code causes problems in the serialization plugin now.

[webfrea-k]

@sandwwraith can anything else cause this? We have a lot of classes too, but I don't think there is a single case where child class would not be marked as @serializable (all the classes top-down are serializable in our case).

[edenman]

I know it's been a couple years, but I'm seeing the same issue https://youtrack.jetbrains.com/issue/KTOR-2174

[SvyatoslavScherbina]

We are migrating issue tracking to YouTrack, so I'm closing this issue in favour of KT-45044.