[proxies] Make Object.{isFrozen,isSealed} 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;
@@ skipping 75 matching lines @@
       ["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]);
 })();
+
+
+(function IsSealed() {
+  var target = [];
+  var proxy = new Proxy(target, handler);
+
+  target.wurst = 42;
+  target[0] = true;
+  Object.defineProperty(target, symbol, {get: undefined});
+
+  // Extensible.
+
+  log.length = 0;
+
+  Object.isSealed(proxy);
+  assertEquals(1, log.length)
+  for (var i in log) assertSame(target, log[i][1]);
+
+  assertArrayEquals(
+      ["isExtensible", target], log[0]);
+
+  // Not extensible but not sealed.
+
+  log.length = 0;
+  Object.preventExtensions(target);
+
+  Object.isSealed(proxy);
+  assertEquals(3, log.length)
+  for (var i in log) assertSame(target, log[i][1]);
+
+  assertArrayEquals(
+      ["isExtensible", target], log[0]);
+  assertArrayEquals(
+      ["ownKeys", target], log[1]);
+  assertArrayEquals(
+      ["getOwnPropertyDescriptor", target, toKey(0)], log[2]);
+
+  // Sealed.
+
+  log.length = 0;
+  Object.seal(target);
+
+  Object.isSealed(proxy);
+  assertEquals(6, log.length)
+  for (var i in log) assertSame(target, log[i][1]);
+
+  assertArrayEquals(
+      ["isExtensible", target], log[0]);
+  assertArrayEquals(
+      ["ownKeys", target], log[1]);
+  assertArrayEquals(
+      ["getOwnPropertyDescriptor", target, toKey(0)], log[2]);
+  assertArrayEquals(
+      ["getOwnPropertyDescriptor", target, toKey("length")], log[3]);
+  assertArrayEquals(
+      ["getOwnPropertyDescriptor", target, toKey("wurst")], log[4]);
+  assertArrayEquals(
+      ["getOwnPropertyDescriptor", target, toKey(symbol)], log[5]);
+})();
+
+
+(function IsFrozen() {
+  var target = [];
+  var proxy = new Proxy(target, handler);
+
+  target.wurst = 42;
+  target[0] = true;
+  Object.defineProperty(target, symbol, {get: undefined});
+
+  // Extensible.
+
+  log.length = 0;
+
+  Object.isFrozen(proxy);
+  assertEquals(1, log.length)
+  for (var i in log) assertSame(target, log[i][1]);
+
+  assertArrayEquals(
+      ["isExtensible", target], log[0]);
+
+  // Not extensible but not frozen.
+
+  log.length = 0;
+  Object.preventExtensions(target);
+
+  Object.isFrozen(proxy);
+  assertEquals(3, log.length)
+  for (var i in log) assertSame(target, log[i][1]);
+
+  assertArrayEquals(
+      ["isExtensible", target], log[0]);
+  assertArrayEquals(
+      ["ownKeys", target], log[1]);
+  assertArrayEquals(
+      ["getOwnPropertyDescriptor", target, toKey(0)], log[2]);
+
+  // Frozen.
+
+  log.length = 0;
+  Object.freeze(target);
+
+  Object.isFrozen(proxy);
+  assertEquals(6, log.length)
+  for (var i in log) assertSame(target, log[i][1]);
+
+  assertArrayEquals(
+      ["isExtensible", target], log[0]);
+  assertArrayEquals(
+      ["ownKeys", target], log[1]);
+  assertArrayEquals(
+      ["getOwnPropertyDescriptor", target, toKey(0)], log[2]);
+  assertArrayEquals(
+      ["getOwnPropertyDescriptor", target, toKey("length")], log[3]);
+  assertArrayEquals(
+      ["getOwnPropertyDescriptor", target, toKey("wurst")], log[4]);
+  assertArrayEquals(
+      ["getOwnPropertyDescriptor", target, toKey(symbol)], log[5]);
+})();