Implement ES2015 class feature (part II.) (#2439)

This patch is the second milestone of the implementation of this new language element.

Supported:
 - Single class inheritance
 - Functionality of 'super' keyword
 - Implicit constructor in class heritage
 - Specific behaviour while extending with the built-in 'Array' or '%TypedArray%' object
 - Abstract subclasses (Mix-ins)

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

tests/jerry/es2015/class-inheritance-builtin-array.js

@@ -0,0 +1,116 @@
+/* Copyright JS Foundation and other contributors, http://js.foundation
+ *
+ * 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.
+ */
+
+ function isInstanceofArray (instance) {
+   assert (instance instanceof C);
+   assert (instance instanceof B);
+   assert (instance instanceof A);
+   assert (instance instanceof Array);
+ }
+
+ class A extends Array {
+   f () {
+     return 5;
+   }
+ }
+
+ class B extends A {
+   g () {
+     return eval ("eval ('super.f ()')");
+   }
+ }
+
+ class C extends B {
+   h () {
+     return eval ('super.g ()');
+   }
+ }
+
+ var c = new C (1, 2, 3, 4, 5, 6);
+
+ isInstanceofArray (c);
+ c.push (7);
+ assert (c.length === 7);
+ assert (c.f () === 5);
+ assert (c.g () === 5);
+ assert (c.h () === 5);
+
+ // Test built-in Array prototype methods
+ var mapped = c.map ((x) => x * 2);
+ isInstanceofArray (mapped);
+
+ for (var i = 0; i < mapped.length; i++) {
+   assert (mapped[i] == c[i] * 2);
+ }
+
+ var concated = c.concat (c);
+ isInstanceofArray (concated);
+
+ for (var i = 0; i < concated.length; i++) {
+   assert (concated[i] == c[i % (concated.length / 2)]);
+ }
+
+ var sliced = c.slice (c);
+ isInstanceofArray (sliced);
+
+ for (var i = 0; i < sliced.length; i++) {
+   assert (sliced[i] == c[i]);
+ }
+
+ var filtered = c.filter ((x) => x > 100);
+ isInstanceofArray (sliced);
+ assert (filtered.length === 0);
+
+ var spliced = c.splice (c.length - 1);
+ isInstanceofArray (spliced);
+ assert (spliced.length === 1);
+ assert (spliced[0] === 7);
+
+ c.constructor = 5;
+
+ try {
+   mapped = c.map ((x) => x * 2);
+   assert (false);
+ } catch (e) {
+   assert (e instanceof TypeError);
+ }
+
+ try {
+   concated = c.concat (c);
+   assert (false);
+ } catch (e) {
+   assert (e instanceof TypeError);
+ }
+
+ try {
+   sliced = c.slice (c);
+   assert (false);
+ } catch (e) {
+   assert (e instanceof TypeError);
+ }
+
+ try {
+   filtered = c.filter ((x) => x > 100);
+   assert (false);
+ } catch (e) {
+   assert (e instanceof TypeError);
+ }
+
+ try {
+   spliced = c.splice (0);
+   assert (false);
+ } catch (e) {
+   assert (e instanceof TypeError);
+ }