Class fields, part 3 (backends)

test/mjsunit/harmony/class-fields-scoping.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
+
+// this
+{
+  class C {
+    a = this;
+  }
+
+  let c = new C;
+  assertEquals(c, c.a);
+}
+
+{
+  class C {
+    static a = this;
+  }
+  assertEquals(C, C.a);
+}
+
+{
+  let sigil = {};
+
+  function outer() {
+    let stored = null;
+    class C {
+      [stored = this] = 0;
+    }
+
+    assertEquals(sigil, stored);
+  }
+
+  outer.call(sigil);
+}
+
+// super
+{
+  class Base {
+    m() {
+      return 0;
+    }
+  }
+
+  class Derived extends Base {
+    m() {
+      return 1;
+    }
+    a = super.m();
+  }
+
+  let c = new Derived;
+  assertEquals(0, c.a);
+}
+
+{
+  class Base {
+    static m() {
+      return 0;
+    }
+  }
+
+  class Derived extends Base {
+    static m() {
+      return 1;
+    }
+    static a = super.m();
+  }
+
+  assertEquals(0, Derived.a);
+}
+
+{
+  let stored = null;
+
+  class OuterBase {
+    m() {
+      return 0;
+    }
+  }
+
+  class OuterDerived extends OuterBase {
+    m() {
+      return 1;
+    }
+
+    constructor() {
+      super();
+
+      class InnerBase {
+        m() {
+          return 2;
+        }
+      }
+
+      class InnerDerived extends InnerBase {
+        m() {
+          return 3;
+        }
+        [stored = super.m()] = 0;
+      }
+    }
+  }
+
+  new OuterDerived;
+
+  assertEquals(0, stored);
+}
+
+// new.target
+{
+  function outer() {
+    class C {
+      a = new.target;
+    }
+
+    let c = new C;
+    assertTrue(c.hasOwnProperty('a'));
+    assertEquals(undefined, c.a);
+  }
+
+  new outer;
+}
+
+{
+  function outer() {
+    class C {
+      static a = new.target;
+    }
+
+    assertTrue(C.hasOwnProperty('a'));
+    assertEquals(undefined, C.a);
+  }
+
+  new outer;
+}
+
+{
+  function outer() {
+    let stored = null;
+
+    class C {
+      [stored = new.target] = 0;
+    }
+    assertEquals(outer, stored);
+  }
+
+  new outer;
+}
+
+// arguments
+{
+  function outer() {
+    let stored_outer = arguments;
+    let stored_ctor;
+
+    class C {
+      a = arguments;
+
+      constructor() {
+        stored_ctor = arguments;
+      }
+    }
+
+    let c = new C;
+    assertEquals('[object Arguments]', Object.prototype.toString.call(c.a));
+    assertFalse(stored_outer === c.a);
+    assertFalse(stored_ctor === c.a);
+  }
+
+  outer();
+}
+
+{
+  function outer() {
+    let stored_outer = arguments;
+
+    class C {
+      static a = arguments;
+    }
+
+    assertEquals('[object Arguments]', Object.prototype.toString.call(C.a));
+    assertFalse(stored_outer === C.a);
+  }
+
+  outer();
+}
+
+{
+  function outer() {
+    let stored = null;
+
+    class C {
+      [stored = arguments] = 0;
+    }
+
+    assertEquals(arguments, stored);
+  }
+
+  outer();
+}
+
+
+// ctor params
+{
+  let b = 0;
+  class C {
+    a = b;
+
+    constructor(b) {}
+  }
+
+  let c = new C(1);
+  assertEquals(0, c.a);
+}
+
+// class declaration name
+{
+  class C {
+    a = C;
+  }
+  let stored_class = C;
+  C = null;
+
+  let c = new stored_class;
+  assertEquals(stored_class, c.a);
+}
+
+{
+  class C {
+    static a = () => C;
+  }
+  let stored_class = C;
+  C = null;
+
+  assertEquals(stored_class, stored_class.a());
+}
+
+{
+  let stored = null;
+
+  class C {
+    [stored = () => C] = 0;
+  }
+  let stored_class = C;
+  C = null;
+
+  assertEquals(stored_class, stored());
+}
+
+{
+  assertThrows(() => {
+    class C {
+      static a = C;
+    }
+  }, ReferenceError);
+}
+
+{
+  assertThrows(() => {
+    class C {
+      [C] = 0;
+    }
+  }, ReferenceError);
+}
+
+// class expression name
+{
+  let C = null;
+  let stored_class = class C {
+    a = C;
+  }
+
+  let c = new stored_class;
+  assertEquals(stored_class, c.a);
+}
+
+{
+  let C = null;
+  let stored_class = class C {
+    static a = () => C;
+  }
+
+  assertEquals(stored_class, stored_class.a());
+}
+
+{
+  let C = null;
+  let stored = null;
+
+  let stored_class = class C {
+    [stored = () => C] = 0;
+  };
+
+  assertEquals(stored_class, stored());
+}
+
+{
+  assertThrows(() => (
+    class C {
+      static a = C;
+    }
+  ), ReferenceError);
+}
+
+{
+  assertThrows(() => (
+    class C {
+      [C] = 0;
+    }
+  ), ReferenceError);
+}