Support Kotlin annotation constructors in reflection

#KT-13106 In Progress

compiler/testData/codegen/box/reflection/createAnnotation/arrayOfKClasses.kt

@@ -0,0 +1,12 @@
+// WITH_REFLECT
+
+import kotlin.reflect.KClass
+import kotlin.test.assertEquals
+
+annotation class Anno(val klasses: Array<KClass<*>> = arrayOf(String::class, Int::class))
+
+fun box(): String {
+    val anno = Anno::class.constructors.single().callBy(emptyMap())
+    assertEquals(listOf(String::class, Int::class), (anno.klasses as Array<KClass<*>>).toList() /* TODO: KT-9453 */)
+    return "OK"
+}

compiler/testData/codegen/box/reflection/createAnnotation/callByKotlin.kt

@@ -0,0 +1,50 @@
+// WITH_REFLECT
+
+import kotlin.reflect.KClass
+import kotlin.reflect.primaryConstructor
+import kotlin.test.assertEquals
+import kotlin.test.assertFails
+
+annotation class NoParams
+annotation class OneDefault(val s: String = "OK")
+annotation class OneNonDefault(val s: String)
+annotation class TwoParamsOneDefault(val s: String, val x: Int = 42)
+annotation class TwoParamsOneDefaultKClass(val string: String, val klass: KClass<*> = Number::class)
+annotation class TwoNonDefaults(val string: String, val klass: KClass<*>)
+
+
+inline fun <reified T : Annotation> create(args: Map<String, Any?>): T {
+    val ctor = T::class.constructors.single()
+    return ctor.callBy(args.mapKeys { entry -> ctor.parameters.single { it.name == entry.key } })
+}
+
+inline fun <reified T : Annotation> create(): T = create(emptyMap())
+
+fun box(): String {
+    create<NoParams>()
+
+    val t1 = create<OneDefault>()
+    assertEquals("OK", t1.s)
+    assertFails { create<OneDefault>(mapOf("s" to 42)) }
+
+    val t2 = create<OneNonDefault>(mapOf("s" to "OK"))
+    assertEquals("OK", t2.s)
+    assertFails { create<OneNonDefault>() }
+
+    val t3 = create<TwoParamsOneDefault>(mapOf("s" to "OK"))
+    assertEquals("OK", t3.s)
+    assertEquals(42, t3.x)
+    val t4 = create<TwoParamsOneDefault>(mapOf("s" to "OK", "x" to 239))
+    assertEquals(239, t4.x)
+    assertFails { create<TwoParamsOneDefault>(mapOf("s" to "Fail", "x" to "Fail")) }
+
+    val t5 = create<TwoParamsOneDefaultKClass>(mapOf("string" to "OK"))
+    assertEquals(Number::class, t5.klass as KClass<*> /* TODO: KT-9453 */)
+
+    assertFails("KClass (not Class) instances should be passed as arguments") {
+        create<TwoNonDefaults>(mapOf("klass" to String::class.java, "string" to "Fail"))
+    }
+
+    val t6 = create<TwoNonDefaults>(mapOf("klass" to String::class, "string" to "OK"))
+    return t6.string
+}

compiler/testData/codegen/box/reflection/createAnnotation/callKotlin.kt

@@ -0,0 +1,35 @@
+// WITH_REFLECT
+
+import kotlin.reflect.KClass
+import kotlin.reflect.primaryConstructor
+import kotlin.test.assertEquals
+import kotlin.test.assertFails
+
+annotation class NoParams
+annotation class OneDefault(val s: String = "Fail")
+annotation class TwoNonDefaults(val string: String, val klass: KClass<*>)
+
+inline fun <reified T : Annotation> create(vararg args: Any?): T =
+        T::class.constructors.single().call(*args)
+
+fun box(): String {
+    create<NoParams>()
+    assertFails { create<NoParams>("Fail") }
+
+    assertFails { create<OneDefault>() }
+    assertFails { create<OneDefault>(42) }
+    val o = create<OneDefault>("OK")
+    assertEquals("OK", o.s)
+
+    assertFails("call() should fail because arguments were passed in an incorrect order") {
+        create<TwoNonDefaults>(Any::class, "Fail")
+    }
+    assertFails("call() should fail because KClass (not Class) instances should be passed as arguments") {
+        create<TwoNonDefaults>("Fail", Any::class.java)
+    }
+
+    val k = create<TwoNonDefaults>("OK", Int::class)
+    assertEquals(Int::class, k.klass as KClass<*> /* TODO: KT-9453 */)
+
+    return k.string
+}