builtins.js revision 85b71799222b55eb5dd74ea26efe0c64ab655c8c 
1// Copyright 2011 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28// Flags: --expose-natives-as=builtins
29
30// Checks that all function properties of the builtin object are neither
31// writable nor configurable. Also, theose functions that are actually
32// constructors (recognized by having properties on their .prototype object),
33// have only unconfigurable properties on the prototype, and the methods
34// are also non-writable.
35
36var names = Object.getOwnPropertyNames(builtins);
37
38function isFunction(obj) {
39  return typeof obj == "function";
40}
41
42function checkConstructor(func, name) {
43  // A constructor is a function with a prototype and properties on the
44  // prototype object besides "constructor";
45  if (name.charAt(0) == "$") return;
46  if (typeof func.prototype != "object") return;
47  var propNames = Object.getOwnPropertyNames(func.prototype);
48  if (propNames.length == 0 ||
49      (propNames.length == 1 && propNames[0] == "constructor")) {
50    // Not a constructor.
51    return;
52  }
53  var proto_desc = Object.getOwnPropertyDescriptor(func, "prototype");
54  assertTrue(proto_desc.hasOwnProperty("value"), name);
55  assertFalse(proto_desc.writable, name);
56  assertFalse(proto_desc.configurable, name);
57  var prototype = proto_desc.value;
58  assertEquals(null, prototype.__proto__, name);
59  for (var i = 0; i < propNames.length; i++) {
60    var propName = propNames[i];
61    if (propName == "constructor") continue;
62    var testName = name + "-" + propName;
63    var propDesc = Object.getOwnPropertyDescriptor(prototype, propName);
64    assertTrue(propDesc.hasOwnProperty("value"), testName);
65    assertFalse(propDesc.configurable, testName);
66    if (isFunction(propDesc.value)) {
67      assertFalse(propDesc.writable, testName);
68    }
69  }
70}
71
72for (var i = 0; i < names.length; i++) {
73  var name = names[i];
74  var desc = Object.getOwnPropertyDescriptor(builtins, name);
75  assertTrue(desc.hasOwnProperty("value"));
76  var value = desc.value;
77  if (isFunction(value)) {
78    assertFalse(desc.writable, name);
79    assertFalse(desc.configurable, name);
80    checkConstructor(value, name);
81  }
82}
83