Has anybody played around and had issues with ` Xdebug` in k

Question

Has anybody played around and had issues with ` Xdebug` in kotlin 1 8 I ve been getting `java lang VerifyError Bad local variable type` errors whenever I turn it on in my project I haven t been able to create a minimal reproducible example yet but it seems to happen around `scope launch` or `channel send` calls

ephemient · Answer

the verifier should tell you which class and method failed right if you dump the bytecode it might have a hint as to what went wrong

daphillips · Answer

That s a good point I ve looked at bit at what the verifier mentions but haven t gotten to the bytecode level yet That s probably a good thing to look into

daphillips · Answer

Blindly poking around at the code though leads to the very interesting discovery that it always seems to be `Type top current frame locals 5 is not assignable to reference type` but at different locations depending on how I manipulate the stack With the peculiar part being that it s always the 5th indexed local variable more to investigate

Norbi · Answer

I ve just run into the same error disappointed ```java lang VerifyError Bad local variable type Exception Details Location W5ldpIw Ljava lang String Lkotlin jvm functions Function1 Lkotlin coroutines Continuation Ljava lang Object 707 iload Reason Type java util concurrent locks Lock current frame locals 9 is not assignable to integer``` Without ` Xdebug` the error goes away

daphillips · Answer

< Norbi> I was able to get a minimal reproducible example I m still uncertain as to what the cause is but I at least have enough now to submit a bug report

daphillips · Answer

for the curious this was the smallest I was able to make it ```fun main = runBlocking Path tmp withContext <http Dispatchers IO|Dispatchers IO> println hello world ```

ephemient · Answer

huh that s interesting it s failing in the code generated for the very first state I can t tell why it s producing that load though

ephemient · Answer

definitely worth filing a YouTrack issue over this

daphillips · Answer

The really interesting part is replacing `Path ` with `Paths get ` seems to fix the issue So I wonder if it s something related to how kotlin inlines `Path ` to target platforms ツ

ephemient · Answer

experimenting with the definition of `<http kotlin io|kotlin io> path Path` this generates OK bytecode ```inline fun Path path String Path = Paths get path ``` while this generates broken bytecode ``` Suppress INVISIBLE REFERENCE INVISIBLE MEMBER kotlin internal InlineOnly inline fun Path path String Path = Paths get path ``` when used in the above reproducer

ephemient · Answer

minimized the example more ```import kotlin coroutines Suppress INVISIBLE REFERENCE INVISIBLE MEMBER kotlin internal InlineOnly inline fun f a Int Int = a fun main suspend f 0 suspendCoroutine lt Unit gt ```

daphillips · Answer

Interesting find I ll make sure to add it in my ticket writeup

daphillips · Answer

I just put in a YT ticket for this issue <https youtrack jetbrains com issue KT 56258 java lang VerifyError Bad local variable type when using XDebug>