[proxies] Make Object.{freeze,seal} behave correctly for proxies.

test/mjsunit/harmony/proxies-integrity.js

+// Copyright 2015 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-proxies --harmony-reflect
+
+
+
+function toKey(x) {
+  if (typeof x === "symbol") return x;
+  return String(x);
+}
+
+
+const noconf = {configurable: false};
+const noconf_nowrite = {configurable: false, writable: false};
+
+
+var symbol = Symbol();
+
+
+var log = [];
+var logger = {};
+var handler = new Proxy({}, logger);
+
+logger.get = function(t, trap, r) {
+  return function() {
+    log.push([trap, ...arguments]);
+    return Reflect[trap](...arguments);
+  }
+};
+
+
+(function Seal() {
+  var target = [];
+  var proxy = new Proxy(target, handler);
+  log.length = 0;
+
+  target.wurst = 42;
+  target[0] = true;
+  Object.defineProperty(target, symbol, {get: undefined});
+
+  Object.seal(proxy);
+  assertEquals(6, log.length)
+  for (var i in log) assertSame(target, log[i][1]);
+
+  assertArrayEquals(
+      ["preventExtensions", target], log[0]);
+  assertArrayEquals(
+      ["ownKeys", target], log[1]);
+  assertArrayEquals(
+      ["defineProperty", target, toKey(0), noconf], log[2]);
+  assertArrayEquals(
+      ["defineProperty", target, toKey("length"), noconf], log[3]);
+  assertArrayEquals(
+      ["defineProperty", target, toKey("wurst"), noconf], log[4]);
+  assertArrayEquals(
+      ["defineProperty", target, toKey(symbol), noconf], log[5]);
+})();
+
+
+(function Freeze() {
+  var target = [];
+  var proxy = new Proxy(target, handler);
+  log.length = 0;
+
+  target.wurst = 42;
+  target[0] = true;
+  Object.defineProperty(target, symbol, {get: undefined});
+
+  Object.freeze(proxy);
+  assertEquals(10, log.length)
+  for (var i in log) assertSame(target, log[i][1]);
+
+  assertArrayEquals(
+      ["preventExtensions", target], log[0]);
+  assertArrayEquals(
+      ["ownKeys", target], log[1]);
+  assertArrayEquals(
+      ["getOwnPropertyDescriptor", target, toKey(0)], log[2]);
+  assertArrayEquals(
+      ["defineProperty", target, toKey(0), noconf_nowrite], log[3]);
+  assertArrayEquals(
+      ["getOwnPropertyDescriptor", target, toKey("length")], log[4]);
+  assertArrayEquals(
+      ["defineProperty", target, toKey("length"), noconf_nowrite], log[5]);
+  assertArrayEquals(
+      ["getOwnPropertyDescriptor", target, toKey("wurst")], log[6]);
+  assertArrayEquals(
+      ["defineProperty", target, toKey("wurst"), noconf_nowrite], log[7]);
+  assertArrayEquals(
+      ["getOwnPropertyDescriptor", target, toKey(symbol)], log[8]);
+  assertArrayEquals(
+      ["defineProperty", target, toKey(symbol), noconf], log[9]);
+})();