src/v8/test/mjsunit/large-object-literal-2.js

// Copyright 2017 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: --allow-natives-syntax

(function TestLargeObjectDictionaryLiteral() {
  // Create potential large-space object literal.
  let properties = [];
  // Constant chosen so the dictionary properties store lies in large object
  // space.
  const max = 0x1ef3e / 3;
  for (let i = 0; i < max; i++) {
    properties.push("p"+i);
  }
  let source = "return { __proto__:null, " + properties.join(":'',") + ":''}"
  let createObject = new Function(source);
  let object = createObject();
  %HeapObjectVerify(object);
  assertFalse(%HasFastProperties(object));
  assertEquals(Object.getPrototypeOf(object ), null);
  let keys = Object.keys(object);
  // modify original object
  object['new_property'] = {};
  object[1] = 12;
  %HeapObjectVerify(object);

  let object2  = createObject();
  %HeapObjectVerify(object2);
  assertFalse(object2 === object);
  assertFalse(%HasFastProperties(object2));
  assertEquals(Object.getPrototypeOf(object2), null);
  assertEquals(keys, Object.keys(object2));
})();