Class fields, part 3 (backends)

test/mjsunit/harmony/class-fields-super.js

+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-class-fields
+
+{
+  class Base {
+    a = 0;
+  }
+
+  class Derived extends Base {
+    b = 1;
+  }
+
+  let c = new Derived;
+  assertTrue(c.hasOwnProperty('a'));
+  assertEquals(0, c.a);
+  assertTrue(c.hasOwnProperty('b'));
+  assertEquals(1, c.b);
+}
+
+{
+  class Base {
+    a = 0;
+  }
+
+  class Derived extends Base {
+    b = 1;
+    constructor() {
+      super();
+    }
+  }
+
+  let c = new Derived;
+  assertTrue(c.hasOwnProperty('a'));
+  assertEquals(0, c.a);
+  assertTrue(c.hasOwnProperty('b'));
+  assertEquals(1, c.b);
+}
+
+{
+  class Base {
+    a = 0;
+  }
+
+  class Derived extends Base {
+    a;
+  }
+
+  let c = new Derived;
+  assertTrue(c.hasOwnProperty('a'));
+  assertEquals(undefined, c.a);
+}
+
+{
+  class Base {
+    a = 0;
+  }
+
+  class Derived extends Base {
+    a;
+    constructor() {
+      super();
+    }
+  }
+
+  let c = new Derived;
+  assertTrue(c.hasOwnProperty('a'));
+  assertEquals(undefined, c.a);
+}
+
+{
+  class Base {
+    a() {
+      return 0;
+    }
+  }
+
+  class Derived extends Base {
+    a = () => eval("super.a()");
+  }
+
+  let c = new Derived;
+  assertEquals(0, c.a());
+}
+
+{
+  class Base {
+    a() {
+      return 0;
+    }
+  }
+
+  class Derived extends Base {
+    a = () => eval("super.a()");
+    constructor() {
+      super();
+    }
+  }
+
+  let c = new Derived;
+  assertEquals(0, c.a());
+}
+
+{
+  class Base {
+    static a() {
+      return 0;
+    }
+  }
+
+  class Derived extends Base {
+    static a = () => eval("super.a()");
+  }
+
+  assertEquals(0, Derived.a());
+}
+
+{
+  let deferred;
+  let hit = false;
+
+  class Base {
+    a = (hit = true, 0);
+    constructor() {
+      hit = true;
+      this.b = (assertEquals(0, this.a), 1);
+    }
+  }
+
+  class Derived extends Base {
+    c = (hit = true, assertEquals(1, this.b), 2);
+    constructor() {
+      deferred = () => super();
+    }
+  }
+  assertFalse(hit);
+
+  let thrown = false;
+  assertThrows(() => new Derived);
+
+  let c = deferred();
+  assertEquals(0, c.a);
+  assertEquals(1, c.b);
+  assertEquals(2, c.c);
+}