[proxies] Make Object.{isFrozen,isSealed} behave correctly for proxies.

test/mjsunit/harmony/proxies-integrity.js

Index: test/mjsunit/harmony/proxies-integrity.js
diff --git a/test/mjsunit/harmony/proxies-integrity.js b/test/mjsunit/harmony/proxies-integrity.js
index 4d1337cd166f2eb3312e87e193147d5320476ecf..9ed6005d6b2ffcbff5d24b57e83dc7605292b4a5 100644
--- a/test/mjsunit/harmony/proxies-integrity.js
+++ b/test/mjsunit/harmony/proxies-integrity.js
@@ -93,3 +93,121 @@ logger.get = function(t, trap, r) {
   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]);
+})();