Reflection: add test on introspection of local classes

kotlin-reflect works correctly already for Kotlin-generated local classes and anonymous objects, but not for Java ones. This is fixed in a subsequent commit. #KT-41373 In Progress
2023-03-28 23:44:42 +02:00
parent 9fcdc10019
commit 1e031d9fb8
16 changed files with 345 additions and 0 deletions
@@ -0,0 +1,144 @@
+// TARGET_BACKEND: JVM
+// WITH_REFLECT
+// FILE: anonymousObjects.kt
+
+package test
+
+import kotlin.reflect.*
+import kotlin.reflect.jvm.isAccessible
+import kotlin.test.*
+
+interface I
+
+fun check(x: KClass<*>, value: Any) {
+    assertEquals(null, x.qualifiedName)
+
+    assertEquals(
+        setOf(
+            "foo", "bar",
+            "equals", "hashCode", "toString"
+        ),
+        x.members.mapTo(hashSetOf()) { it.name }
+    )
+
+    assertEquals(emptyList(), x.annotations)
+    assertEquals(emptyList(), x.nestedClasses)
+    assertEquals(null, x.objectInstance)
+    assertEquals(emptyList(), x.sealedSubclasses)
+
+    assertEquals(listOf(typeOf<I>(), typeOf<Any>()), x.supertypes)
+
+    // Local class visibility cannot be represented in Kotlin, so `KClass.visibility` is null.
+    assertEquals(null, x.visibility)
+
+    // It's not really important whether the class is considered final or open, but it shouldn't be both (or neither).
+    assertTrue(x.isFinal xor x.isOpen)
+
+    assertFalse(x.isAbstract)
+    assertFalse(x.isSealed)
+    assertFalse(x.isData)
+    assertFalse(x.isInner)
+    assertFalse(x.isCompanion)
+    assertFalse(x.isFun)
+    assertFalse(x.isValue)
+
+    assertFalse(x.isInstance(42))
+    assertTrue(x.isInstance(value))
+
+    val equals = x.members.single { it.name == "equals" } as KFunction<Boolean>
+    assertTrue(equals.call(value, value))
+
+    val foo = x.members.single { it.name == "foo" }.apply { isAccessible = true } as KFunction<String>
+    assertEquals("OK", foo.call(value))
+
+    val bar = x.members.single { it.name == "bar" }.apply { isAccessible = true } as KProperty1<Any, Int>
+    assertEquals(42, bar.get(value))
+}
+
+fun checkKotlinAnonymousObject() {
+    val anonymousObject = object : I {
+        val bar: Int = 42
+        fun foo(): String = "OK"
+    }
+    val klass = anonymousObject::class
+
+    // isAnonymousClass/simpleName behavior is different for Kotlin anonymous classes in JDK 1.8 and 9+, see KT-23072.
+    if (klass.java.isAnonymousClass) {
+        assertEquals(null, klass.simpleName)
+    } else {
+        assertEquals("anonymousObject\$1", klass.simpleName)
+    }
+
+    assertEquals(emptyList(), klass.constructors)
+
+    check(klass, anonymousObject)
+}
+
+fun checkKotlinLocalClass() {
+    class Local : I {
+        val bar: Int = 42
+        fun foo(): String = "OK"
+    }
+    val instance = Local()
+    val klass = instance::class
+
+    // simpleName behavior is different for Kotlin anonymous classes in JDK 1.8 and 9+, see KT-23072.
+    assertTrue(klass.simpleName!!.endsWith("Local"))
+
+    assertEquals(listOf("fun `<init>`(): test.`AnonymousObjectsKt\$checkKotlinLocalClass\$Local`"), klass.constructors.map { it.toString() })
+
+    check(klass, instance)
+}
+
+fun checkJavaAnonymousObject() {
+    val anonymousObject = JavaClass.anonymousObject()
+    val klass = anonymousObject::class
+
+    assertEquals(null, klass.simpleName)
+
+    assertEquals(listOf("fun `<init>`(): `JavaClass$1`"), klass.constructors.map { it.toString() })
+
+    check(klass, anonymousObject)
+}
+
+fun checkJavaLocalClass() {
+    val instance = JavaClass.localClassInstance()
+    val klass = instance::class
+
+    assertEquals("Local", klass.simpleName)
+
+    assertEquals(listOf("fun `<init>`(): Local"), klass.constructors.map { it.toString() })
+
+    check(klass, instance)
+}
+
+fun box(): String {
+    checkKotlinAnonymousObject()
+    checkKotlinLocalClass()
+
+    // TODO: fails with KotlinReflectionInternalError: Unresolved class: class JavaClass$1 (kind = null)
+    // checkJavaAnonymousObject()
+    // checkJavaLocalClass()
+
+    return "OK"
+}
+
+// FILE: JavaClass.java
+
+public class JavaClass {
+    public static Object anonymousObject() {
+        return new test.I() {
+            int bar = 42;
+            String foo() { return "OK"; }
+        };
+    }
+
+    public static Object localClassInstance() {
+        class Local implements test.I {
+            int bar = 42;
+            String foo() { return "OK"; }
+        }
+
+        return new Local();
+    }
+}