Reflection: add KVisibility, KClass.visibility, KCallable.visibility

core/builtins/src/kotlin/reflect/KCallable.kt

@@ -63,6 +63,11 @@ public interface KCallable<out R> : KAnnotatedElement {
      */
     public fun callBy(args: Map<KParameter, Any?>): R
 
+    /**
+     * Visibility of this callable, or `null` if its visibility cannot be represented in Kotlin.
+     */
+    public val visibility: KVisibility?
+
     /**
      * `true` if this callable is `final`.
      */

core/builtins/src/kotlin/reflect/KClass.kt

@@ -73,6 +73,11 @@ public interface KClass<T : Any> : KDeclarationContainer, KAnnotatedElement, KCl
      */
     public val supertypes: List<KType>
 
+    /**
+     * Visibility of this class, or `null` if its visibility cannot be represented in Kotlin.
+     */
+    public val visibility: KVisibility?
+
     /**
      * `true` if this class is `final`.
      */

core/builtins/src/kotlin/reflect/KVisibility.kt

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2010-2016 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kotlin.reflect
+
+/**
+ * Visibility is an aspect of a Kotlin declaration regulating where that declaration is accessible in the source code.
+ * Visibility can be changed with one of the following modifiers: `public`, `protected`, `internal`, `private`.
+ *
+ * Note that some Java visibilities such as package-private and protected (which also gives access to items from the same package)
+ * cannot be represented in Kotlin, so there's no [KVisibility] value corresponding to them.
+ *
+ * See the [Kotlin language documentation](https://kotlinlang.org/docs/reference/visibility-modifiers.html)
+ * for more information.
+ */
+enum class KVisibility {
+    /**
+     * Visibility of declarations marked with the `public` modifier, or with no modifier at all.
+     */
+    PUBLIC,
+
+    /**
+     * Visibility of declarations marked with the `protected` modifier.
+     */
+    PROTECTED,
+
+    /**
+     * Visibility of declarations marked with the `internal` modifier.
+     */
+    INTERNAL,
+
+    /**
+     * Visibility of declarations marked with the `private` modifier.
+     */
+    PRIVATE,
+}