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()];
+
+function throw_in_current() { Realm.eval(Realm.current(), "throw Error()"); };
+
+Realm.shared = {
+  throw_in_current: throw_in_current,
+  thrower_0: (function thrower_0() { Realm.shared.throw_in_current(); }),
+  thrower_1: Realm.eval(realms[1],
+      "(function thrower_1() { Realm.shared.throw_in_current(); })"),
+};
+
+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;                                             \
+ }"
+
+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());
+for (var i = 0; i < Realm.shared.error_0.length; i++) {
+  assertFalse(Realm.shared.thrower_0 === Realm.shared.error_0[i].getFunction());
+}
+for (var i = 0; i < Realm.shared.error_1.length; i++) {
+  assertFalse(Realm.shared.thrower_0 === Realm.shared.error_1[i].getFunction());
+}
+
+Realm.eval(realms[0], script);
+assertSame(6, Realm.shared.error_0.length);
+assertSame(5, Realm.shared.error_1.length);
+
+assertTrue(Realm.shared.thrower_0 === Realm.shared.error_0[3].getFunction());
+for (var i = 0; i < Realm.shared.error_0.length; i++) {
+  assertFalse(Realm.shared.thrower_1 === Realm.shared.error_0[i].getFunction());
+}
+for (var i = 0; i < Realm.shared.error_1.length; i++) {
+  assertFalse(Realm.shared.thrower_1 === Realm.shared.error_1[i].getFunction());
+}