node/deps/v8/test/mjsunit/builtins.js

// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Flags: --allow-natives-syntax --expose-natives-as=builtins

// Verify that the builtin typed arrays have been pretenured.
assertFalse(%InNewSpace(builtins.kMath));
assertFalse(%InNewSpace(builtins.rempio2result));
assertFalse(%InNewSpace(builtins.rngstate));

// Checks that all function properties of the builtin object that are actually
// constructors (recognized by having properties on their .prototype object),
// have only unconfigurable properties on the prototype, and the methods
// are also non-writable.

var names = Object.getOwnPropertyNames(builtins);

function isFunction(obj) {
  return typeof obj == "function";
}

function isV8Native(name) {
  return name == "GeneratorFunction" ||
      name == "GeneratorFunctionPrototype" ||
      name == "SetIterator" ||
      name == "MapIterator" ||
      name == "ArrayIterator" ||
      name == "StringIterator";
}
var V8NativePrototypes = {
  GeneratorFunction: Function.prototype,
  // TODO(jugglinmike): Update the following values to the %IteratorPrototype%
  //                    intrinsic once it is implemented.
  // Issue 3568: Generator Prototype should have an object between itself
  //             and Object.prototype
  // https://code.google.com/p/v8/issues/detail?id=3568
  GeneratorFunctionPrototype: Object.prototype,
  SetIterator: Object.prototype,
  MapIterator: Object.prototype,
  ArrayIterator: Object.prototype,
  StringIterator: Object.prototype
};

function checkConstructor(func, name) {
  // A constructor is a function with a prototype and properties on the
  // prototype object besides "constructor";
  if (name.charAt(0) == "$") return;
  if (typeof func.prototype != "object") return;
  var propNames = Object.getOwnPropertyNames(func.prototype);
  if (propNames.length == 0 ||
      (propNames.length == 1 && propNames[0] == "constructor")) {
    // Not a constructor.
    return;
  }
  var proto_desc = Object.getOwnPropertyDescriptor(func, "prototype");
  assertTrue(proto_desc.hasOwnProperty("value"), name);
  assertFalse(proto_desc.writable, name);
  assertFalse(proto_desc.configurable, name);
  var prototype = proto_desc.value;
  assertEquals(V8NativePrototypes[name] || null,
               Object.getPrototypeOf(prototype),
               name);
  for (var i = 0; i < propNames.length; i++) {
    var propName = propNames[i];
    if (propName == "constructor") continue;
    if (isV8Native(name)) continue;
    var testName = name + "-" + propName;
    var propDesc = Object.getOwnPropertyDescriptor(prototype, propName);
    assertTrue(propDesc.hasOwnProperty("value"), testName);
    assertFalse(propDesc.configurable, testName);
    if (isFunction(propDesc.value)) {
      assertFalse(propDesc.writable, testName);
    }
  }
}

for (var i = 0; i < names.length; i++) {
  var name = names[i];
  var desc = Object.getOwnPropertyDescriptor(builtins, name);
  assertTrue(desc.hasOwnProperty("value"));
  var value = desc.value;
  if (isFunction(value)) {
    checkConstructor(value, name);
  }
}