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-bound.js

@@ -0,0 +1,28 @@
+/* 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.
+ */
+
+var g = Array.bind (0, 1, 2, 3)
+g.prototype = Array.prototype;
+
+class C extends g {}
+
+class D extends C {
+  constructor () {
+    super (4, 5);
+  }
+}
+
+var d = new D;
+assert (Object.getPrototypeOf (d) == D.prototype);

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);
+ }

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

@@ -0,0 +1,74 @@
+/* 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 isInstanceofTypedArray (instance) {
+   assert (instance instanceof C);
+   assert (instance instanceof B);
+   assert (instance instanceof A);
+   assert (instance instanceof Uint8Array);
+ }
+
+ class A extends Uint8Array {
+   f () {
+     return 5;
+   }
+ }
+
+ class B extends A {
+   g () {
+     return super.f ();
+   }
+ }
+
+ class C extends B {
+   h () {
+     return super.g ();
+   }
+ }
+
+ var c = new C ([1, 2, 3, 4, 5, 6]);
+
+ isInstanceofTypedArray (c);
+ assert (c.length === 6);
+ assert (c.f () === 5)
+ assert (c.g () === 5)
+ assert (c.h () === 5)
+
+ var mapped = c.map ((x) => x * 2);
+ isInstanceofTypedArray (mapped);
+
+ for (var i = 0; i < mapped.length; i++) {
+   assert (mapped[i] == c[i] * 2);
+ }
+
+ var filtered = c.filter ((x) => x > 100);
+ isInstanceofTypedArray (filtered);
+ assert (filtered.length === 0);
+
+ c.constructor = 5;
+
+ try {
+   mapped = c.map ((x) => x * 2);
+   assert (false);
+ } catch (e) {
+   assert (e instanceof TypeError)
+ }
+
+ try {
+   filtered = c.filter ((x) => x > 100);
+   assert (false);
+ } catch (e) {
+   assert (e instanceof TypeError)
+ }

tests/jerry/es2015/class-inheritance-core-1.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.
+ */
+
+class Animal {
+  constructor (name) {
+    this.name = name;
+  }
+
+  hello () {
+    return "Hello I am " + this.name;
+  }
+
+  static speak () {
+    return "Animals roar.";
+  }
+
+  static explain () {
+    return "I can walk,";
+  }
+
+  whoAmI () {
+    return "I am an Animal.";
+  }
+
+  breath () {
+    return "I am breathing.";
+  }
+
+  get myName () {
+    return this.name;
+  }
+
+  set rename (name) {
+    this.name = name;
+  }
+}
+
+class Dog extends Animal {
+  constructor (name, barks) {
+    super (name);
+    this.barks = barks;
+  }
+
+  hello () {
+    return super.hello () + " and I can " + (this.barks ? "bark" : "not bark");
+  }
+
+  whoAmI () {
+    return "I am a Dog.";
+  }
+
+  static speak () {
+    return "Dogs bark.";
+  }
+
+  static explain () {
+    return super.explain () + " jump,";
+  }
+
+  bark () {
+    return this.barks ? "Woof" : "----";
+  }
+}
+
+class Doge extends Dog {
+  constructor (name, barks, awesomeness) {
+    super (name, barks);
+    this.awesomeness = awesomeness;
+  }
+
+  hello () {
+    return super.hello () + " and I'm " + (this.awesomeness > 9000 ? "super awesome" : "awesome") + ".";
+  }
+
+  whoAmI ( ) {
+    return "I am a Doge.";
+  }
+
+  static speak () {
+    return "Doges wow.";
+  }
+
+  static explain () {
+    return super.explain () + " dance.";
+  }
+}
+
+var doge = new Doge ("doggoe", true, 10000);
+assert (doge.name === "doggoe");
+doge.rename = "doggo";
+assert (doge.myName === "doggo");
+assert (doge.barks === true);
+assert (doge.awesomeness === 10000);
+assert (doge.hello () === "Hello I am doggo and I can bark and I'm super awesome.");
+assert (doge.whoAmI () === "I am a Doge.");
+assert (doge.breath () === "I am breathing.");
+assert (doge.bark () === "Woof");
+assert (Doge.speak () === "Doges wow.");
+assert (Doge.explain () === "I can walk, jump, dance.");
+assert (doge instanceof Animal);
+assert (doge instanceof Dog);
+assert (doge instanceof Doge);
+assert (Dog.prototype.constructor === Dog)
+assert (Doge.prototype.constructor === Doge)

tests/jerry/es2015/class-inheritance-core-10.js

@@ -0,0 +1,29 @@
+/* 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.
+ */
+
+ class A extends Array {
+   constructor () {
+     return null;
+   }
+ }
+
+ class B extends A { }
+
+ try {
+   new B;
+   assert (false);
+ } catch (e) {
+   assert (e instanceof TypeError);
+ }

tests/jerry/es2015/class-inheritance-core-11.js

@@ -0,0 +1,30 @@
+/* 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.
+ */
+
+ class A extends Array {
+   constructor () {
+     assert (false);
+     return null;
+   }
+ }
+
+ class B extends A {
+   constructor () {
+     return { o : 10 };
+   }
+ }
+
+ var b = new B;
+ assert (b.o === 10);

tests/jerry/es2015/class-inheritance-core-12.js

@@ -0,0 +1,50 @@
+/* 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.
+ */
+
+ class A extends Array {
+   constructor (a, b, c) {
+     eval ("eval ('super (a, b, c)')");
+     eval ("eval ('this.f = 5;')");
+     assert (this.h ()()() === 5);
+
+     return { o : 4 };
+   }
+
+   g () {
+     return function () {
+       return 5;
+     }
+   }
+ }
+
+ class B extends A {
+   constructor (a, b, c) {
+     eval ("eval ('super (a, b, c)')");
+     assert (this.f === undefined)
+     assert (this.o === 4)
+     this.k = 5;
+     return { o : 7 };
+   }
+
+   h () {
+     return super["g"];
+   }
+ }
+
+ var b = new B (1, 2, 3, 4);
+ assert (b.k === undefined);
+ assert (b.o === 7);
+ assert (b.h === undefined);
+ assert (b.g === undefined);

tests/jerry/es2015/class-inheritance-core-13.js

@@ -0,0 +1,32 @@
+/* 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.
+ */
+
+ class C extends Array {
+   constructor (a, b) {
+     var a = eval ('super (arguments);');
+   }
+ }
+
+ class D extends C {
+   constructor () {
+      var a = eval ("eval ('super (1, 2);')");
+      return
+   }
+ }
+
+ var d = new D;
+ assert (JSON.stringify (d) === '[{"0":1,"1":2}]');
+ assert (d + "" === "[object Arguments]");
+ assert (d.length === 1);

tests/jerry/es2015/class-inheritance-core-14.js

@@ -0,0 +1,53 @@
+/* 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.
+ */
+
+class A {
+  constructor () {
+    this.a = 5;
+  }
+
+  f () {
+    return 10;
+  }
+
+  super () {
+    this.super = 10;
+    return 15;
+  }
+}
+
+class B extends A {
+  constructor () {
+    super ();
+    assert (super.f === A.prototype.f);
+    super.f = 8;
+    assert (this.f === 8);
+    assert (super.f === A.prototype.f);
+
+    assert (this.a === 5);
+    super.a = 10;
+    assert (this.a === 10);
+
+    assert (super.super () === 15);
+    assert (this.super === 10);
+    super.super = 20;
+    assert (this.super === 20);
+    assert (super.super () === 15);
+  }
+}
+
+var b = new B;
+assert (b.f === 8);
+assert (b.a === 10);

tests/jerry/es2015/class-inheritance-core-15.js

@@ -0,0 +1,27 @@
+/* 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.
+ */
+
+ class A extends Array {
+   constructor () {
+     super ();
+     return;
+   }
+ };
+
+ var a = new A;
+ assert (a.length === 0);
+ assert (a instanceof Array);
+ assert (a instanceof A);
+ assert (JSON.stringify (a) === "[]");

tests/jerry/es2015/class-inheritance-core-2.js

@@ -0,0 +1,38 @@
+/* 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.
+ */
+
+ class C {
+   static a () {
+     return 5;
+   }
+ }
+
+ class D extends C {
+   constructor () {
+     super ();
+   }
+ }
+
+ assert (D.a () === 5);
+
+ C.a = function () {
+   return 6;
+ }
+
+ assert (D.a () === 6);
+
+ C = 5;
+
+ assert (D.a () === 6);

tests/jerry/es2015/class-inheritance-core-3.js

@@ -0,0 +1,27 @@
+/* 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.
+ */
+
+class A extends Array {
+  constructor (a, b, c) {
+    super (a, b);
+    this.f = 5;
+  }
+}
+
+class B extends A { }
+
+var b = new B (1, 2, 3, 4);
+assert (b.f === 5);
+assert (b.length === 2);

tests/jerry/es2015/class-inheritance-core-4.js

@@ -0,0 +1,34 @@
+/* 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.
+ */
+
+ class A extends Array {
+   constructor (a, b, c) {
+     super (a, b);
+     this.f = 5;
+   }
+ }
+
+ class B extends A {
+   constructor (a, b, c) {
+     super (a, b);
+     this.g = super.f;
+     this.h = this.f;
+   }
+ }
+
+ var b = new B (1, 2, 3, 4);
+ assert (b.g === undefined);
+ assert (b.h === 5);
+ assert (b.length === 2);

tests/jerry/es2015/class-inheritance-core-5.js

@@ -0,0 +1,27 @@
+/* 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.
+ */
+
+ class A extends Array {
+   constructor (a, b, c) {
+     eval ("eval ('super (a, b, c)')");
+     eval ("eval ('this.f = 5;')");
+   }
+ }
+
+ class B extends A { }
+
+ var b = new B (1, 2, 3, 4);
+ assert (b.f === 5);
+ assert (b.length === 3);

tests/jerry/es2015/class-inheritance-core-6.js

@@ -0,0 +1,37 @@
+/* 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.
+ */
+
+ class A extends Array {
+   constructor (a, b, c, d, e) {
+     eval ("eval ('super (a, b, c)')");
+     this.a = 6;
+     return new String ("foo");
+   }
+
+   f () {
+     return 5;
+   }
+ }
+
+ class B extends A {
+   constructor (a, b, c, d) {
+    eval ("eval ('super (a, b, c, d)')");
+    assert (super.f () === 5);
+   }
+ }
+
+ var a = new B (1, 2, 3, 4, 5, 6);
+ assert (a.a === undefined);
+ assert (a[0] + a[1] + a[2] === "foo");

tests/jerry/es2015/class-inheritance-core-7.js

@@ -0,0 +1,32 @@
+/* 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.
+ */
+
+ class C extends Array {
+   constructor () {
+     var a = eval ('super (1, 2); 5');
+     assert (a === 5);
+   }
+ }
+
+ class D extends C {
+   constructor () {
+      var a = eval ("eval ('super (1, 2); 3')");
+      assert (a === 3);
+   }
+ }
+
+ var d = new D;
+
+ assert (JSON.stringify (d) === "[1,2]");

tests/jerry/es2015/class-inheritance-core-8.js

@@ -0,0 +1,85 @@
+/* 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.
+ */
+
+ var A = Array;
+ var order = 0;
+
+ function f () {
+   order++;
+
+   return function () {
+     return A;
+   }
+ }
+
+ var B = class extends f ()() {
+   constructor () {
+     assert (++order === 2);
+     eval ("eval ('super (1, 2, 3, 4)')");
+     try {
+       super (1, 2, 3, 4, 5)
+       assert (false);
+     } catch (e) {
+       assert (e instanceof ReferenceError)
+     }
+
+     assert (this.g ()()()() === 10);
+     assert (eval ("eval ('this.g ()')()")()() === 10);
+     assert (eval ("eval ('this.g ()')")()()() === 10);
+     assert (eval ("eval ('this.g ()()()')")() === 10);
+     assert (eval ("eval ('this.g')")()()()() === 10);
+     this.push (5);
+     assert (this.length === 5)
+     eval ('this.push (6)');
+     assert (this.length === 6);
+     eval ("eval ('this.push (7)')");
+     this.j = 6;
+     return;
+   }
+ }
+
+ var C = class extends B {
+   g () {
+     return function () {
+       return () => {
+         return 10;
+       }
+     }
+   }
+ }
+
+ var D = class D extends C {
+    constructor () {
+      super ();
+      this.k = 5;
+      return
+    }
+
+    g () {
+      return eval ('super["g"]');
+    }
+ }
+
+ assert (order === 1);
+
+ var d = new D;
+ assert (d.length === 7);
+ assert (d.k === 5);
+ assert (d.j === 6);
+ assert (d instanceof D);
+ assert (d instanceof C);
+ assert (d instanceof B);
+ assert (d instanceof f ()());
+ assert (JSON.stringify (d) === "[1,2,3,4,5,6,7]");

tests/jerry/es2015/class-inheritance-core-9.js

@@ -0,0 +1,29 @@
+/* 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.
+ */
+
+ var order = 0;
+
+ try {
+   var A = class extends null {
+     constructor () {
+       order++;
+     }
+   }
+
+   new A;
+ } catch (e) {
+   assert (order === 1);
+   assert (e instanceof ReferenceError);
+ }

tests/jerry/es2015/class-inheritance-early-semantics.js

@@ -0,0 +1,133 @@
+/* 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 must_throw (str) {
+  try {
+    eval ("switch (1) { default: " + str + "}");
+    assert (false);
+  } catch (e) { }
+
+  try {
+    eval (str);
+    assert (false);
+  }
+  catch (e) { }
+
+  try {
+    eval ("'use strict'; switch (1) { default: " + str + "}");
+    assert (false);
+  } catch (e) { }
+
+  try {
+    eval ("'use strict'; " + str);
+    assert (false);
+  } catch (e) { }
+}
+
+class A {
+  constructor (a) {
+    this.a = a;
+  }
+
+  f () {
+    return 5;
+  }
+}
+
+must_throw ("class B extends 5 + 6 + 5 { constructor (a, b) { super (a) } }");
+
+must_throw ("class B extends null { constructor () { super () } }; new B");
+
+must_throw ("var o = { a : 5 }; \
+             class B extends Object.keys (o)[0] { constructor (a, b) { super (a) } } \
+             var b = new B (1, 2);");
+
+must_throw ("class B extends A { constructor (a, b) { this.b = b} } \
+             var b = new B (1, 2);");
+
+must_throw ("class B extends A { constructor (a, b) { super.f () } } \
+             var b = new B (1, 2);");
+
+must_throw ("class B extends A { constructor (a, b) { eval ('this.b = b') } } \
+             var b = new B (1, 2);");
+
+must_throw ("class B extends A { constructor (a, b) { eval ('super.f ()') } } \
+             var b = new B (1, 2);");
+
+must_throw ("class B extends A { constructor (a, b) { super (a); super (a); } } \
+             var b = new B (1, 2);");
+
+must_throw ("class B extends A { constructor (a, b) { eval ('super (a)'); eval ('super (a)'); } } \
+             var b = new B (1, 2);");
+
+must_throw ("class B extends A { constructor (a, b) { super (a) } g () { super (a) } } \
+             var b = new B (1, 2);");
+
+must_throw ("class B extends A { constructor (a, b) { super (a) } g () { eval ('super (a)') } } \
+             var b = new B (1, 2); \
+             b.g ();");
+
+must_throw ("class B extends A { constructor (a, b) { super (a) } g () { return function () { return super.f () } } } \
+             var b = new B (1, 2); \
+             b.g ()();");
+
+must_throw ("class B extends A { constructor (a, b) { super (a) } \
+                                 g () { return function () { return eval ('super.f ()') } } } \
+             var b = new B (1, 2); \
+             b.g ()();");
+
+must_throw ("class B extends A { constructor (a, b) { super (a) } \
+                                 g () { return function () { return eval (\"eval ('super.f ();')\") } } } \
+             var b = new B (1, 2); \
+             b.g ()();");
+
+must_throw ("class A extends Array { constructor () { return 5; } }; new A");
+
+must_throw ("class A extends Array { constructor () { return undefined; } }; new A");
+
+must_throw ("class B extends undefined { }; new B;");
+
+must_throw ("var A = class extends Array { . }");
+
+must_throw ("class Array extends Array { }");
+
+must_throw ("class A extends A { }");
+
+must_throw ("class A extends { constructor () { super () } }");
+
+class B extends A {
+  constructor (a, b) {
+    super (a);
+    assert (super.f () === 5);
+  }
+
+  g () {
+    return () => {
+      return super.f ();
+    }
+  }
+
+  h () {
+    return () => {
+      return () => {
+        return eval ('super.f ()');
+      }
+    }
+  }
+}
+
+var b = new B (1, 2);
+assert (b.g ()() === 5);
+assert (b.h ()()() === 5);

tests/jerry/es2015/class-inheritance-mixins-1.js

@@ -0,0 +1,38 @@
+/* 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.
+ */
+
+var calculatorMixin = Base => class extends Base {
+  f () {
+    return 1;
+  }
+};
+
+var randomizerMixin = Base => class extends Base {
+  g () {
+    return 2;
+  }
+};
+
+class A {
+  constructor () { }
+}
+
+class B extends calculatorMixin (randomizerMixin (A)) {
+
+}
+
+var b = new B ();
+assert (b.f () === 1)
+assert (b.g () === 2);

tests/jerry/es2015/class-inheritance-mixins-2.js

@@ -0,0 +1,50 @@
+/* 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.
+ */
+
+ order = 0;
+
+ var Mixin1 = (superclass) => class extends superclass {
+   foo () {
+     assert (order++ == 1)
+     if (super.foo) {
+       super.foo ();
+     }
+   }
+ };
+
+ var Mixin2 = (superclass) => class extends superclass {
+   foo () {
+     assert (order++ == 2)
+     if (super.foo) {
+       assert (super.foo () === 5);
+     }
+   }
+ };
+
+ class S {
+   foo () {
+     assert (order++ == 3)
+     return 5;
+   }
+ }
+
+ class C extends Mixin1 (Mixin2 (S)) {
+   foo () {
+     assert (order++ == 0)
+     super.foo ();
+   }
+ }
+
+ new C ().foo ()

tests/unit-core/test-snapshot.c

@@ -223,7 +223,7 @@ main (void)
     /* Check the snapshot data. Unused bytes should be filled with zeroes */
     const uint8_t expected_data[] =
     {
-      0x4A, 0x52, 0x52, 0x59, 0x12, 0x00, 0x00, 0x00,
+      0x4A, 0x52, 0x52, 0x59, 0x13, 0x00, 0x00, 0x00,
       0x00, 0x00, 0x00, 0x00, 0x48, 0x00, 0x00, 0x00,
       0x01, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00,
       0x03, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00,