Prepare JVM runtime for support of reflection on functions

Introduce abstract class FunctionReference, which is supposed to be a
superclass for all anonymous classes generated for function references. Each
anonymous subclass will have statically-generated symbol info, which will be
used by reflection to locate the symbol

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

@@ -14,11 +14,11 @@
  * limitations under the License.
  */
 
-package kotlin.reflect.jvm.internal
-
-import kotlin.jvm.internal.ExtensionFunctionImpl
+package kotlin.reflect
 
 /**
- * @suppress
+ * Represents a local function.
+ *
+ * @param R the return type of the function.
  */
-public abstract class KExtensionFunctionImpl<in T, out R> : ExtensionFunctionImpl<T, R>()
+public interface KLocalFunction<out R> : KFunction<R>

core/reflection.jvm/src/kotlin/reflect/jvm/internal/ReflectionFactoryImpl.java

@@ -16,6 +16,7 @@
 
 package kotlin.reflect.jvm.internal;
 
+import kotlin.jvm.internal.FunctionReference;
 import kotlin.jvm.internal.ReflectionFactory;
 import kotlin.reflect.*;
 
@@ -39,6 +40,15 @@ public class ReflectionFactoryImpl extends ReflectionFactory {
         return InternalPackage.foreignKotlinClass(javaClass);
     }
 
+    // Functions
+
+    @Override
+    public KFunction function(FunctionReference f) {
+        return f;
+    }
+
+    // Properties
+
     @Override
     public KMemberProperty memberProperty(String name, KClass owner) {
         return ((KClassImpl) owner).memberProperty(name);

core/runtime.jvm/src/kotlin/jvm/internal/ExtensionFunctionImpl.kt

@@ -1,23 +0,0 @@
-/*
- * Copyright 2010-2015 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.jvm.internal
-
-import java.io.Serializable
-
-public abstract class ExtensionFunctionImpl : Serializable {
-    override fun toString() = "${(this as Object).getClass().getGenericInterfaces()[0]}"
-}

core/runtime.jvm/src/kotlin/jvm/internal/FunctionReference.java

@@ -14,13 +14,14 @@
  * limitations under the License.
  */
 
-package kotlin.reflect.jvm.internal
+package kotlin.jvm.internal;
 
-import java.io.Serializable
+import kotlin.reflect.*;
 
-/**
- * @suppress
- */
-public abstract class KMemberFunctionImpl<in T, out R> : Serializable {
-    override fun toString() = "${javaClass.getGenericInterfaces().first()}"
+public abstract class FunctionReference
+        extends FunctionImpl
+        implements KTopLevelFunction,
+                   KMemberFunction,
+                   KTopLevelExtensionFunction,
+                   KLocalFunction {
 }

core/runtime.jvm/src/kotlin/jvm/internal/MemberFunctionImpl.kt

@@ -1,23 +0,0 @@
-/*
- * Copyright 2010-2015 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.jvm.internal
-
-import java.io.Serializable
-
-public abstract class MemberFunctionImpl : Serializable {
-    override fun toString() = "${(this as Object).getClass().getGenericInterfaces()[0]}"
-}

core/runtime.jvm/src/kotlin/jvm/internal/Reflection.java

@@ -59,6 +59,14 @@ public class Reflection {
         return factory.foreignKotlinClass(javaClass);
     }
 
+    // Functions
+
+    public static KFunction function(FunctionReference f) {
+        return factory.function(f);
+    }
+
+    // Properties
+
     public static KMemberProperty memberProperty(String name, KClass owner) {
         return factory.memberProperty(name, owner);
     }

core/runtime.jvm/src/kotlin/jvm/internal/ReflectionFactory.java

@@ -32,6 +32,14 @@ public class ReflectionFactory {
         throw error();
     }
 
+    // Functions
+
+    public KFunction function(FunctionReference f) {
+        return f;
+    }
+
+    // Properties
+
     public KMemberProperty memberProperty(String name, KClass owner) {
         throw error();
     }