Load name of the original anonymous/synthetic class which was copied during inline (KT-21320)

loadOriginName.kt

import org.jetbrains.kotlin.serialization.jvm.*

@Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
fun loadOriginName(className: String) {
    val metadata = Class.forName(className).declaredAnnotations
        .filter { it.annotationClass.qualifiedName == "kotlin.Metadata" }
        .single() as Metadata

    if (metadata.k == 3 && metadata.d1.isNotEmpty()) {
        // Synthetic classes generated for lambdas/coroutines
        val (nameResolver, functionProto) = JvmProtoBufUtil.readFunctionDataFrom(metadata.d1, metadata.d2)
        assert(functionProto.hasExtension(JvmProtoBuf.lambdaClassOriginName))
        val nameIndex = functionProto.getExtension(JvmProtoBuf.lambdaClassOriginName)
        val originName = nameResolver.getString(nameIndex)
        println("Origin class for lambda class $className is $originName")
    } else if (metadata.k == 1) {
        // Anonymous classes generated for object literals
        val (nameResolver, classProto) = JvmProtoBufUtil.readClassDataFrom(metadata.d1, metadata.d2)
        assert(classProto.hasExtension(JvmProtoBuf.anonymousObjectOriginName))
        val nameIndex = classProto.getExtension(JvmProtoBuf.anonymousObjectOriginName)
        val originName = nameResolver.getString(nameIndex)
        println("Origin class for anonymous object $className is $originName")
    } else {
        println("Unable to determine origin class for class $className")
    }
}

fun main(args: Array<String>) {
    // Example usage (replace with an existing class name):
    loadOriginName("test.TestKt\$box\$\$inlined\$checker\$1")
}