Allow global prototype to be a Proxy

test/mjsunit/es6/global-proto-proxy.js

+// Copyright 2011 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

[caitp, 2017/02/03 22:41:31]

The license header can be shrunk down to just

```
// Copyright 2018 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.
```

+
+var global = this;
+;(function () {
+  var calledDelete = false;
+  var calledGet = false;
+  var calledHas = false;
+  var calledSet = false;
+  var target = {};
+  var assertEquals = global.assertEquals;
+  var proxy = new Proxy(target, {
+    has(target, property) {
+      calledHas = true;
+      return Reflect.has(target, property);
+    },
+    get(target, property, receiver) {
+      calledGet = true;
+      return Reflect.get(target, property, receiver);
+    },
+    set(targer, property, value, receiver) {
+      calledSet = true;
+      return Reflect.set(target, property, value, receiver);
+    },
+    delete(target, property, receiver) {
+      calledDelete = true;
+      return Reflect.delete(target, property, receiver);
+    }
+  });
+  Object.setPrototypeOf(global, proxy);

[caitp, 2017/02/03 22:41:31]

Shouldn't this throw due to https://github.com/heycam/webidl/pull/133 ? Or does
d8's global not share the immutable prototype behaviour

+  getGlobal;
+  assertEquals(true, calledGet);

[caitp, 2017/02/03 22:41:31]

Nit: assertTrue() is usually recommended over assertEquals(true, ...), though in
practice they're the same thing.

+  makeGlobal = 2;
+  assertEquals(true, calledSet);
+  "findGlobal" in global;
+  assertEquals(true, calledHas);
+  var deletedOwn = delete makeGlobal;
+  assertEquals(true, deletedOwn);
+  assertEquals(void 0, makeGlobal);
+})();