Remove unneeded CallerImpl implementations

Also fix a bug where nullability of the assigned value was not checked
in ClassCompanionFieldSetter because it wasn't a subclass of FieldSetter
where this check occurred

compiler/testData/codegen/box/reflection/call/disallowNullValueForNotNullField.kt

@@ -23,6 +23,14 @@ class CounterTest<T>(t: T) {
     private var generic: T = t
 }
 
+class C {
+    companion object {
+        private var z: String = ""
+
+        fun getBoundZ() = this::z
+    }
+}
+
 fun box(): String {
     val p = A::class.memberProperties.single() as KMutableProperty1<A, String?>
     p.isAccessible = true
@@ -47,5 +55,19 @@ fun box(): String {
     d.isAccessible = true
     d.setter.call(CounterTest(""), null) // Also should not fail, because we can't be sure about nullability of 'generic'
 
+    val z = C.Companion::class.memberProperties.single { it.name == "z" } as KMutableProperty1<C.Companion, String?>
+    z.isAccessible = true
+    try {
+        z.setter.call(C, null)
+        return "Fail: exception should have been thrown"
+    } catch (e: IllegalArgumentException) {}
+
+    val zz = C.getBoundZ() as KMutableProperty0<String?>
+    zz.isAccessible = true
+    try {
+        zz.setter.call(null)
+        return "Fail: exception should have been thrown"
+    } catch (e: IllegalArgumentException) {}
+
     return "OK"
 }

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KPropertyImpl.kt

@@ -179,42 +179,14 @@ private fun KPropertyImpl.Accessor<*, *>.computeCallerForAccessor(isGetter: Bool
         return ThrowingCaller
     }
 
-    fun isInsideClassCompanionObject(): Boolean {
-        val possibleCompanionObject = property.descriptor.containingDeclaration
-        return DescriptorUtils.isCompanionObject(possibleCompanionObject) &&
-                !DescriptorUtils.isInterface(possibleCompanionObject.containingDeclaration)
-    }
+    fun isJvmStaticProperty(): Boolean =
+        property.descriptor.annotations.hasAnnotation(JVM_STATIC)
 
-    fun isInsideJvmInterfaceCompanionObject(): Boolean {
-        val possibleCompanionObject = property.descriptor.containingDeclaration
-        return DescriptorUtils.isCompanionObject(possibleCompanionObject) &&
-                (DescriptorUtils.isInterface(possibleCompanionObject.containingDeclaration) ||
-                        DescriptorUtils.isAnnotationClass(possibleCompanionObject.containingDeclaration))
-    }
-
-    fun isInsideInterfaceCompanionObjectWithJvmField(): Boolean {
-        val propertyDescriptor = property.descriptor
-        if (propertyDescriptor !is DeserializedPropertyDescriptor || !isInsideJvmInterfaceCompanionObject()) return false
-        return JvmProtoBufUtil.isMovedFromInterfaceCompanion(propertyDescriptor.proto)
-    }
-
-    fun isJvmStaticProperty() =
-        property.descriptor.annotations.findAnnotation(JVM_STATIC) != null
-
-    fun isNotNullProperty() =
+    fun isNotNullProperty(): Boolean =
         !TypeUtils.isNullableType(property.descriptor.type)
 
     fun computeFieldCaller(field: Field): Caller<Field> = when {
-        isInsideClassCompanionObject() || isInsideInterfaceCompanionObjectWithJvmField() -> {
-            val klass = (descriptor.containingDeclaration as ClassDescriptor).toJavaClass()!!
-            if (isGetter)
-                if (isBound) CallerImpl.BoundClassCompanionFieldGetter(field, klass)
-                else CallerImpl.ClassCompanionFieldGetter(field, klass)
-            else
-                if (isBound) CallerImpl.BoundClassCompanionFieldSetter(field, klass)
-                else CallerImpl.ClassCompanionFieldSetter(field, klass)
-        }
-        !Modifier.isStatic(field.modifiers) ->
+        property.descriptor.isJvmFieldPropertyInCompanionObject() || !Modifier.isStatic(field.modifiers) ->
             if (isGetter)
                 if (isBound) CallerImpl.BoundInstanceFieldGetter(field, property.boundReceiver)
                 else CallerImpl.InstanceFieldGetter(field)
@@ -293,3 +265,15 @@ private fun KPropertyImpl.Accessor<*, *>.computeCallerForAccessor(isGetter: Bool
         }
     }
 }
+
+private fun PropertyDescriptor.isJvmFieldPropertyInCompanionObject(): Boolean {
+    val container = containingDeclaration
+    if (!DescriptorUtils.isCompanionObject(container)) return false
+
+    val outerClass = container.containingDeclaration
+    return when {
+        DescriptorUtils.isInterface(outerClass) || DescriptorUtils.isAnnotationClass(outerClass) ->
+            this is DeserializedPropertyDescriptor && JvmProtoBufUtil.isMovedFromInterfaceCompanion(proto)
+        else -> true
+    }
+}

core/reflection.jvm/src/kotlin/reflect/jvm/internal/calls/CallerImpl.kt

@@ -128,7 +128,7 @@ internal abstract class CallerImpl<out M : Member>(
 
     abstract class FieldGetter(
         field: ReflectField,
-        requiresInstance: Boolean = !Modifier.isStatic(field.modifiers)
+        requiresInstance: Boolean
     ) : CallerImpl<ReflectField>(
         field,
         field.genericType,
@@ -144,7 +144,7 @@ internal abstract class CallerImpl<out M : Member>(
     abstract class FieldSetter(
         field: ReflectField,
         private val notNull: Boolean,
-        requiresInstance: Boolean = !Modifier.isStatic(field.modifiers)
+        requiresInstance: Boolean
     ) : CallerImpl<ReflectField>(
         field,
         Void.TYPE,
@@ -164,9 +164,9 @@ internal abstract class CallerImpl<out M : Member>(
         }
     }
 
-    class StaticFieldGetter(field: ReflectField) : FieldGetter(field)
+    class StaticFieldGetter(field: ReflectField) : FieldGetter(field, requiresInstance = false)
 
-    class InstanceFieldGetter(field: ReflectField) : FieldGetter(field)
+    class InstanceFieldGetter(field: ReflectField) : FieldGetter(field, requiresInstance = true)
 
     class JvmStaticInObjectFieldGetter(field: ReflectField) : FieldGetter(field, requiresInstance = true) {
         override fun checkArguments(args: Array<*>) {
@@ -175,18 +175,7 @@ internal abstract class CallerImpl<out M : Member>(
         }
     }
 
-    class ClassCompanionFieldGetter(field: ReflectField, klass: Class<*>) : CallerImpl<ReflectField>(
-        field, field.genericType, klass, emptyArray()
-    ) {
-        override fun call(args: Array<*>): Any? {
-            checkArguments(args)
-            return member.get(args.first())
-        }
-    }
-
-    class BoundInstanceFieldGetter(field: ReflectField, private val boundReceiver: Any?) : FieldGetter(
-        field, requiresInstance = false
-    ) {
+    class BoundInstanceFieldGetter(field: ReflectField, private val boundReceiver: Any?) : FieldGetter(field, requiresInstance = false) {
         override fun call(args: Array<*>): Any? {
             checkArguments(args)
             return member.get(boundReceiver)
@@ -195,18 +184,9 @@ internal abstract class CallerImpl<out M : Member>(
 
     class BoundJvmStaticInObjectFieldGetter(field: ReflectField) : FieldGetter(field, requiresInstance = false)
 
-    class BoundClassCompanionFieldGetter(field: ReflectField, private val boundReceiver: Any?) : FieldGetter(
-        field, requiresInstance = false
-    ) {
-        override fun call(args: Array<*>): Any? {
-            checkArguments(args)
-            return member.get(boundReceiver)
-        }
-    }
+    class StaticFieldSetter(field: ReflectField, notNull: Boolean) : FieldSetter(field, notNull, requiresInstance = false)
 
-    class StaticFieldSetter(field: ReflectField, notNull: Boolean) : FieldSetter(field, notNull)
-
-    class InstanceFieldSetter(field: ReflectField, notNull: Boolean) : FieldSetter(field, notNull)
+    class InstanceFieldSetter(field: ReflectField, notNull: Boolean) : FieldSetter(field, notNull, requiresInstance = true)
 
     class JvmStaticInObjectFieldSetter(field: ReflectField, notNull: Boolean) : FieldSetter(field, notNull, requiresInstance = true) {
         override fun checkArguments(args: Array<*>) {
@@ -215,18 +195,8 @@ internal abstract class CallerImpl<out M : Member>(
         }
     }
 
-    class ClassCompanionFieldSetter(field: ReflectField, klass: Class<*>) : CallerImpl<ReflectField>(
-        field, Void.TYPE, klass, arrayOf(field.genericType)
-    ) {
-        override fun call(args: Array<*>): Any? {
-            checkArguments(args)
-            return member.set(null, args.last())
-        }
-    }
-
-    class BoundInstanceFieldSetter(field: ReflectField, notNull: Boolean, private val boundReceiver: Any?) : FieldSetter(
-        field, notNull, false
-    ) {
+    class BoundInstanceFieldSetter(field: ReflectField, notNull: Boolean, private val boundReceiver: Any?) :
+        FieldSetter(field, notNull, requiresInstance = false) {
         override fun call(args: Array<*>): Any? {
             checkArguments(args)
             return member.set(boundReceiver, args.first())
@@ -242,15 +212,6 @@ internal abstract class CallerImpl<out M : Member>(
         }
     }
 
-    class BoundClassCompanionFieldSetter(field: ReflectField, klass: Class<*>) : CallerImpl<ReflectField>(
-        field, Void.TYPE, klass, arrayOf(field.genericType)
-    ) {
-        override fun call(args: Array<*>): Any? {
-            checkArguments(args)
-            return member.set(null, args.last())
-        }
-    }
-
     companion object {
         @Suppress("UNCHECKED_CAST")
         inline fun <reified T> Array<out T>.dropFirst(): Array<T> =