Switch @GradleOption params to enum classes.

This should improve developers UX when using this annotation.

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/GradleOption.kt

@@ -20,36 +20,32 @@ import kotlin.reflect.KClass
 import kotlin.reflect.KVisibility
 
 /**
- * @param value should be one of [DefaultValue] constants
- * @param gradleInputType should be one of [GradleInputTypes] constants
+ * @param value should be one of [DefaultValue] enum values
+ * @param gradleInputType should be one of [GradleInputTypes] enum values
  */
 @Retention(AnnotationRetention.RUNTIME)
 annotation class GradleOption(
-    val value: Int,
-    val gradleInputType: String,
+    val value: DefaultValue,
+    val gradleInputType: GradleInputTypes,
     val shouldGenerateDeprecatedKotlinOptions: Boolean = false
 )
 
-// Enum class here is not possible due to bug in K2 compiler:
-// https://youtrack.jetbrains.com/issue/KT-54079
-object DefaultValue {
-    const val BOOLEAN_FALSE_DEFAULT = 0
-    const val BOOLEAN_TRUE_DEFAULT = 1
-    const val STRING_NULL_DEFAULT = 2
-    const val EMPTY_STRING_LIST_DEFAULT = 3
-    const val LANGUAGE_VERSIONS = 4
-    const val API_VERSIONS = 5
-    const val JVM_TARGET_VERSIONS = 6
-    const val JS_ECMA_VERSIONS = 7
-    const val JS_MODULE_KINDS = 8
-    const val JS_SOURCE_MAP_CONTENT_MODES = 9
-    const val JS_MAIN = 10
-    const val JS_SOURCE_MAP_NAMES_POLICY = 11
+enum class DefaultValue {
+    BOOLEAN_FALSE_DEFAULT,
+    BOOLEAN_TRUE_DEFAULT,
+    STRING_NULL_DEFAULT,
+    EMPTY_STRING_LIST_DEFAULT,
+    LANGUAGE_VERSIONS,
+    API_VERSIONS,
+    JVM_TARGET_VERSIONS,
+    JS_ECMA_VERSIONS,
+    JS_MODULE_KINDS,
+    JS_SOURCE_MAP_CONTENT_MODES,
+    JS_MAIN,
+    JS_SOURCE_MAP_NAMES_POLICY,
 }
 
-// Enum class here is not possible due to bug in K2 compiler:
-// https://youtrack.jetbrains.com/issue/KT-54079
-object GradleInputTypes {
-    const val INPUT = "org.gradle.api.tasks.Input"
-    const val INTERNAL = "org.gradle.api.tasks.Internal"
+enum class GradleInputTypes(val gradleType: String) {
+    INPUT("org.gradle.api.tasks.Input"),
+    INTERNAL("org.gradle.api.tasks.Internal")
 }

generators/tests/org/jetbrains/kotlin/generators/arguments/GenerateGradleOptions.kt

@@ -9,6 +9,7 @@ import org.jetbrains.kotlin.cli.common.arguments.*
 import org.jetbrains.kotlin.config.LanguageVersion
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.utils.Printer
+import org.jetbrains.kotlin.utils.addToStdlib.firstIsInstanceOrNull
 import java.io.File
 import java.io.PrintStream
 import kotlin.reflect.KAnnotatedElement
@@ -557,7 +558,7 @@ private fun Printer.generateImpl(
                     val defaultValue = it.gradleValues
                     var value = defaultValue.defaultValue
                     if (value != "null" && defaultValue.toArgumentConverter != null) {
-                       value = "$value${defaultValue.toArgumentConverter.substringAfter("this")}"
+                        value = "$value${defaultValue.toArgumentConverter.substringAfter("this")}"
                     }
                     println("args.${it.name} = $value")
                 }
@@ -615,7 +616,7 @@ private fun Printer.generatePropertyProvider(
     modifiers: String = ""
 ) {
     if (property.gradleDefaultValue == "null" &&
-        property.gradleInputType == GradleInputTypes.INPUT
+        property.gradleInputTypeAsEnum == GradleInputTypes.INPUT
     ) {
         println("@get:org.gradle.api.tasks.Optional")
     }
@@ -746,7 +747,6 @@ private val KProperty1<*, *>.gradleValues: DefaultValues
             DefaultValue.JS_MODULE_KINDS -> DefaultValues.JsModuleKinds
             DefaultValue.JS_SOURCE_MAP_CONTENT_MODES -> DefaultValues.JsSourceMapContentModes
             DefaultValue.JS_SOURCE_MAP_NAMES_POLICY -> DefaultValues.JsSourceMapNamesPolicies
-            else -> throw IllegalArgumentException("Unknown GradleOption value type: $this")
         }
     }
 
@@ -793,14 +793,17 @@ private val KProperty1<*, *>.gradleLazyReturnTypeInstantiator: String
         }
     }
 
-private val KProperty1<*, *>.gradleInputType: String get() =
-    findAnnotation<GradleOption>()!!.gradleInputType
+private val KProperty1<*, *>.gradleInputTypeAsEnum: GradleInputTypes
+    get() = findAnnotation<GradleOption>()!!.gradleInputType
+
+private val KProperty1<*, *>.gradleInputType: String
+    get() = findAnnotation<GradleOption>()!!.gradleInputType.gradleType
 
 private val KProperty1<*, *>.generateDeprecatedKotlinOption: Boolean
     get() = findAnnotation<GradleOption>()!!.shouldGenerateDeprecatedKotlinOptions
 
 private inline fun <reified T> KAnnotatedElement.findAnnotation(): T? =
-    annotations.filterIsInstance<T>().firstOrNull()
+    annotations.firstIsInstanceOrNull()
 
 object DeprecatedOptionAnnotator {
     fun generateOptionAnnotation(annotation: GradleDeprecatedOption): String {