Support references to extension properties in JVM codegen

#KT-1183 In Progress

core/runtime.jvm/src/kotlin/reflect/jvm/internal/KExtensionPropertyImpl.kt

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2010-2014 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.jvm.internal
+
+import java.lang.reflect.Method
+
+open class KExtensionPropertyImpl<T, out R>(
+        name: String,
+        protected val owner: KPackageImpl,
+        protected val receiverClass: Class<T>
+) : KExtensionProperty<T, R>, KPropertyImpl<R>(name) {
+    // TODO: extract, make lazy (weak?), use our descriptors knowledge, support Java fields
+    protected val getter: Method = owner.jClass.getMethod(getterName(name), receiverClass)
+
+    override fun get(receiver: T): R {
+        return getter(null, receiver) as R
+    }
+}
+
+class KMutableExtensionPropertyImpl<T, R>(
+        name: String,
+        owner: KPackageImpl,
+        receiverClass: Class<T>
+) : KMutableExtensionProperty<T, R>, KExtensionPropertyImpl<T, R>(name, owner, receiverClass) {
+    private val setter = owner.jClass.getMethod(setterName(name), receiverClass, getter.getReturnType()!!)
+
+    override fun set(receiver: T, value: R) {
+        setter.invoke(null, receiver, value)
+    }
+}