filter out .caller from other worlds

test/mjsunit/cross-realm-filtering.js

+// Copyright 2014 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 realms = [Realm.current(), Realm.create()];
+
+// Check stack trace filtering across security contexts.
+var thrower_script =
+    "(function () { Realm.eval(Realm.current(), 'throw Error()') })";
+Realm.shared = {
+  thrower_0: Realm.eval(realms[0], thrower_script),
+  thrower_1: Realm.eval(realms[1], thrower_script),
+};
+
+var script = "                                                                 \
+  Error.prepareStackTrace = function(a, b) { return b; };                      \
+  try {                                                                        \
+    Realm.shared.thrower_0();                                                  \
+  } catch (e) {                                                                \
+    Realm.shared.error_0 = e.stack;                                            \
+  }                                                                            \
+  try {                                                                        \
+    Realm.shared.thrower_1();                                                  \
+  } catch (e) {                                                                \
+    Realm.shared.error_1 = e.stack;                                            \
+  }                                                                            \
+";
+
+function assertNotIn(thrower, error) {
+  for (var i = 0; i < error.length; i++) {
+    assertFalse(false === error[i].getFunction());
+  }
+}
+
+Realm.eval(realms[1], script);
+assertSame(3, Realm.shared.error_0.length);
+assertSame(4, Realm.shared.error_1.length);
+
+assertTrue(Realm.shared.thrower_1 === Realm.shared.error_1[2].getFunction());
+assertNotIn(Realm.shared.thrower_0, Realm.shared.error_0);
+assertNotIn(Realm.shared.thrower_0, Realm.shared.error_1);
+
+Realm.eval(realms[0], script);
+assertSame(5, Realm.shared.error_0.length);
+assertSame(4, Realm.shared.error_1.length);
+
+assertTrue(Realm.shared.thrower_0 === Realm.shared.error_0[2].getFunction());
+assertNotIn(Realm.shared.thrower_1, Realm.shared.error_0);
+assertNotIn(Realm.shared.thrower_1, Realm.shared.error_1);
+
+
+// Check .caller filtering across security contexts.
+var caller_script = "(function (f) { f(); })";
+Realm.shared = {
+  caller_0 : Realm.eval(realms[0], caller_script),
+  caller_1 : Realm.eval(realms[1], caller_script),
+}
+
+script = "                                                                     \
+  function f_0() { Realm.shared.result_0 = arguments.callee.caller; };         \
+  function f_1() { Realm.shared.result_1 = arguments.callee.caller; };         \
+  Realm.shared.caller_0(f_0);                                                  \
+  Realm.shared.caller_1(f_1);                                                  \
+";
+
+Realm.eval(realms[1], script);
+assertSame(null, Realm.shared.result_0);
+assertSame(Realm.shared.caller_1, Realm.shared.result_1);
+
+Realm.eval(realms[0], script);
+assertSame(Realm.shared.caller_0, Realm.shared.result_0);
+assertSame(null, Realm.shared.result_1);