[KxSerialization] Fix "IllegalAccessError: Update to static final field"

Fixes #KT-57647

For value classes, if you add code to companion anonymous init block in IR, it will be executed in the instance constructor. This causes an error when initializing static fields, because writing to them can only occur from the <clinit> method.

The solution is to transfer the static field initialization code from an anonymous init block to the IR initializer of this field

Merge-request: KT-MR-9633
Merged-by: Sergey Shanshin <Sergey.Shanshin@jetbrains.com>

plugins/kotlinx-serialization/tests/org/jetbrains/kotlinx/serialization/TestGenerator.kt

@@ -48,6 +48,10 @@ fun main(args: Array<String>) {
                 model("boxIr")
             }
 
+            testClass<AbstractSerializationJdk11IrBoxTest> {
+                model("jdk11BoxIr")
+            }
+
             testClass<AbstractSerializationFirLightTreeBlackBoxTest> {
                 model("boxIr")
                 model("firMembers")

plugins/kotlinx-serialization/tests/org/jetbrains/kotlinx/serialization/runners/BoxTests.kt

@@ -19,6 +19,13 @@ open class AbstractSerializationIrBoxTest : AbstractIrBlackBoxCodegenTest() {
     }
 }
 
+open class AbstractSerializationJdk11IrBoxTest : AbstractIrBlackBoxCodegenTest() {
+    override fun configure(builder: TestConfigurationBuilder) {
+        super.configure(builder)
+        builder.configureForKotlinxSerialization(useJdk11 = true)
+    }
+}
+
 open class AbstractSerializationWithoutRuntimeIrBoxTest : AbstractIrBlackBoxCodegenTest() {
     override fun configure(builder: TestConfigurationBuilder) {
         super.configure(builder)

plugins/kotlinx-serialization/tests/org/jetbrains/kotlinx/serialization/serializationConfiguration.kt

@@ -8,17 +8,18 @@ package org.jetbrains.kotlinx.serialization
 import org.jetbrains.kotlin.cli.jvm.config.addJvmClasspathRoots
 import org.jetbrains.kotlin.compiler.plugin.CompilerPluginRegistrar
 import org.jetbrains.kotlin.config.CompilerConfiguration
-import org.jetbrains.kotlin.fir.extensions.FirExtensionRegistrarAdapter
+import org.jetbrains.kotlin.config.JvmTarget
 import org.jetbrains.kotlin.test.TargetBackend
+import org.jetbrains.kotlin.test.TestJdkKind
 import org.jetbrains.kotlin.test.bind
 import org.jetbrains.kotlin.test.builders.TestConfigurationBuilder
 import org.jetbrains.kotlin.test.model.TestModule
+import org.jetbrains.kotlin.test.runners.codegen.configureModernJavaTest
 import org.jetbrains.kotlin.test.services.EnvironmentConfigurator
 import org.jetbrains.kotlin.test.services.RuntimeClasspathProvider
 import org.jetbrains.kotlin.test.services.TestServices
 import org.jetbrains.kotlinx.serialization.compiler.extensions.SerializationComponentRegistrar
 import org.jetbrains.kotlinx.serialization.compiler.extensions.SerializationIntrinsicsState
-import org.jetbrains.kotlinx.serialization.compiler.fir.FirSerializationExtensionRegistrar
 import java.io.File
 
 private val librariesPaths = listOfNotNull(RuntimeLibraryInClasspathTest.coreLibraryPath, RuntimeLibraryInClasspathTest.jsonLibraryPath)
@@ -57,10 +58,15 @@ class SerializationRuntimeClasspathJsProvider(testServices: TestServices) : Runt
 
 fun TestConfigurationBuilder.configureForKotlinxSerialization(
     noLibraries: Boolean = false,
-    target: TargetBackend = TargetBackend.JVM
+    target: TargetBackend = TargetBackend.JVM,
+    useJdk11: Boolean = false
 ) {
     useConfigurators(::SerializationEnvironmentConfigurator.bind(noLibraries))
 
+    if (useJdk11) {
+        configureModernJavaTest(TestJdkKind.FULL_JDK_11, JvmTarget.JVM_11)
+    }
+
     if (!noLibraries) {
         when (target) {
             TargetBackend.JVM, TargetBackend.JVM_IR -> useCustomRuntimeClasspathProviders(::SerializationRuntimeClasspathJvmProvider)