v8/test/mjsunit/array-feedback.js

// Copyright 2012 the V8 project authors. All rights reserved.
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// Flags: --allow-natives-syntax --expose-gc
// Flags: --opt --no-always-opt --no-stress-fullcodegen

// Verify that cross context calls work
(function (){
  var realmA = Realm.current();
  var realmB = Realm.create();
  assertEquals(0, realmA);
  assertEquals(1, realmB);

  function instanceof_check(type) {
    assertTrue(type() instanceof type);
    assertTrue(type(5) instanceof type);
    assertTrue(type(1,2,3) instanceof type);
  }

  var realmBArray = Realm.eval(realmB, "Array");
  instanceof_check(Array);
  instanceof_check(Array);
  instanceof_check(Array);
  instanceof_check(realmBArray);
  instanceof_check(realmBArray);
  instanceof_check(realmBArray);
})();