Fix warnings in module 'reflection.jvm', clarify some code

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

@@ -33,10 +33,10 @@ open class KMemberExtensionPropertyImpl<D : Any, E, out R>(
 
     override val field: Field? get() = null
 
-    override fun get(dispatchReceiver: D, extensionReceiver: E): R {
+    override fun get(instance: D, extensionReceiver: E): R {
         try {
             [suppress("UNCHECKED_CAST")]
-            return getter.invoke(dispatchReceiver, extensionReceiver) as R
+            return getter.invoke(instance, extensionReceiver) as R
         }
         catch (e: IllegalAccessException) {
             throw IllegalPropertyAccessException(e)
@@ -60,9 +60,9 @@ class KMutableMemberExtensionPropertyImpl<D : Any, E, R>(
 ) : KMemberExtensionPropertyImpl<D, E, R>(container, computeDescriptor), KMutableMemberExtensionProperty<D, E, R>, KMutablePropertyImpl<R> {
     override val setter: Method get() = super<KMemberExtensionPropertyImpl>.setter!!
 
-    override fun set(dispatchReceiver: D, extensionReceiver: E, value: R) {
+    override fun set(instance: D, extensionReceiver: E, value: R) {
         try {
-            setter.invoke(dispatchReceiver, extensionReceiver, value)
+            setter.invoke(instance, extensionReceiver, value)
         }
         catch (e: IllegalAccessException) {
             throw IllegalPropertyAccessException(e)

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

@@ -27,11 +27,11 @@ open class KMemberPropertyImpl<T : Any, out R>(
 ) : DescriptorBasedProperty(computeDescriptor), KMemberProperty<T, R>, KPropertyImpl<R> {
     override val name: String get() = descriptor.getName().asString()
 
-    override fun get(receiver: T): R {
+    override fun get(instance: T): R {
         try {
             val getter = getter
             [suppress("UNCHECKED_CAST")]
-            return if (getter != null) getter(receiver) as R else field!!.get(receiver) as R
+            return if (getter != null) getter(instance) as R else field!!.get(instance) as R
         }
         catch (e: IllegalAccessException) {
             throw IllegalPropertyAccessException(e)
@@ -53,10 +53,10 @@ class KMutableMemberPropertyImpl<T : Any, R>(
         container: KClassImpl<T>,
         computeDescriptor: () -> PropertyDescriptor
 ) : KMemberPropertyImpl<T, R>(container, computeDescriptor), KMutableMemberProperty<T, R>, KMutablePropertyImpl<R> {
-    override fun set(receiver: T, value: R) {
+    override fun set(instance: T, value: R) {
         try {
             val setter = setter
-            if (setter != null) setter(receiver, value) else field!!.set(receiver, value)
+            if (setter != null) setter(instance, value) else field!!.set(instance, value)
         }
         catch (e: IllegalAccessException) {
             throw IllegalPropertyAccessException(e)

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

@@ -36,7 +36,7 @@ object RuntimeTypeMapper : JavaToKotlinClassMapBuilder() {
     private val kotlinFqNameToJvmDescNullable = linkedMapOf<FqName, String>()
     private val jvmDescToKotlinClassId = linkedMapOf<String, ClassId>();
 
-    {
+    init {
         init()
         initPrimitives()
     }
@@ -85,6 +85,13 @@ object RuntimeTypeMapper : JavaToKotlinClassMapBuilder() {
         val classifier = type.getConstructor().getDeclarationDescriptor()
         if (classifier is TypeParameterDescriptor) return mapTypeToJvmDesc(classifier.getUpperBounds().first())
 
+        if (KotlinBuiltIns.isArray(type)) {
+            val elementType = KotlinBuiltIns.getInstance().getArrayElementType(type)
+            // makeNullable is called here to map primitive types to the corresponding wrappers,
+            // because the given type is Array<Something>, not SomethingArray
+            return "[" + mapTypeToJvmDesc(TypeUtils.makeNullable(elementType))
+        }
+
         val classDescriptor = classifier as ClassDescriptor
         val fqNameUnsafe = DescriptorUtils.getFqName(classDescriptor)
         if (fqNameUnsafe.isSafe()) {
@@ -95,18 +102,6 @@ object RuntimeTypeMapper : JavaToKotlinClassMapBuilder() {
             kotlinFqNameToJvmDesc[fqName]?.let { return it }
         }
 
-        if (KotlinBuiltIns.isArray(type)) {
-            var dimension = 0
-            var elementType = type
-
-            while (KotlinBuiltIns.isArray(elementType)) {
-                elementType = KotlinBuiltIns.getInstance().getArrayElementType(elementType)
-                dimension++
-            }
-
-            return "[".repeat(dimension) + mapTypeToJvmDesc(TypeUtils.makeNullable(elementType))
-        }
-
         return classDescriptor.classId.desc
     }
 

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

@@ -31,6 +31,7 @@ fun <T> foreignKotlinClass(jClass: Class<T>): KClassImpl<T> {
     val name = jClass.getName()
     val cached = FOREIGN_K_CLASSES[name]
     if (cached is WeakReference<*>) {
+        [suppress("UNCHECKED_CAST")]
         val kClass = cached.get() as KClassImpl<T>?
         if (kClass?.jClass == jClass) {
             return kClass!!