js/src/jsapi-tests/testAddPropertyPropcache.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * vim: set ts=8 sts=2 et sw=2 tw=80:
   3  */
   4 /* This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   7
   8 #include "js/Array.h"               // JS::NewArrayObject
   9 #include "js/PropertyAndElement.h"  // JS_DefineElement, JS_DefineProperty
  10 #include "jsapi-tests/tests.h"
  11
  12 static int callCount = 0;
  13
  14 static bool AddProperty(JSContext* cx, JS::HandleObject obj, JS::HandleId id,
  15                         JS::HandleValue v) {
  16   callCount++;
  17   return true;
  18 }
  19
  20 static const JSClassOps AddPropertyClassOps = {
  21     AddProperty,  // addProperty
  22     nullptr,      // delProperty
  23     nullptr,      // enumerate
  24     nullptr,      // newEnumerate
  25     nullptr,      // resolve
  26     nullptr,      // mayResolve
  27     nullptr,      // finalize
  28     nullptr,      // call
  29     nullptr,      // construct
  30     nullptr,      // trace
  31 };
  32
  33 static const JSClass AddPropertyClass = {"AddPropertyTester", 0,
  34                                          &AddPropertyClassOps};
  35
  36 BEGIN_TEST(testAddPropertyHook) {
  37   /*
  38    * Do the test a bunch of times, because sometimes we seem to randomly
  39    * miss the propcache.
  40    */
  41   static const int ExpectedCount = 100;
  42
  43   JS::RootedObject obj(cx, JS::NewArrayObject(cx, 0));
  44   CHECK(obj);
  45   JS::RootedValue arr(cx, JS::ObjectValue(*obj));
  46
  47   CHECK(JS_DefineProperty(cx, global, "arr", arr, JSPROP_ENUMERATE));
  48
  49   JS::RootedObject arrObj(cx, &arr.toObject());
  50   for (int i = 0; i < ExpectedCount; ++i) {
  51     obj = JS_NewObject(cx, &AddPropertyClass);
  52     CHECK(obj);
  53     CHECK(JS_DefineElement(cx, arrObj, i, obj, JSPROP_ENUMERATE));
  54   }
  55
  56   // Now add a prop to each of the objects, but make sure to do
  57   // so at the same bytecode location so we can hit the propcache.
  58   EXEC(
  59       "'use strict';                                     \n"
  60       "for (var i = 0; i < arr.length; ++i)              \n"
  61       "  arr[i].prop = 42;                               \n");
  62
  63   CHECK(callCount == ExpectedCount);
  64
  65   return true;
  66 }
  67 END_TEST(testAddPropertyHook)