mfbt/ChaosMode.h
author Peter Van der Beken <peterv@propagandism.org>
Sat, 15 Feb 2014 22:12:34 +0100
changeset 196441 0ad53ad7c80897776821bcb60eb99340879a15a3
parent 189854 f656d2fd42644436d984504570af35e6d57bc5ec
child 205018 038794b1a5bc9886976d9eac1d626f7b31e027b3
permissions -rw-r--r--
Bug 993710 - Don't return names when enumerating Navigator/Window if they wouldn't be resolved. r=bz.

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_ChaosMode_h
#define mozilla_ChaosMode_h

#include <stdint.h>
#include <stdlib.h>

namespace mozilla {

/**
 * When "chaos mode" is activated, code that makes implicitly nondeterministic
 * choices is encouraged to make random and extreme choices, to test more
 * code paths and uncover bugs.
 */
class ChaosMode
{
  public:
    static bool isActive()
    {
      // Flip this to true to activate chaos mode
      return false;
    }

    /**
     * Returns a somewhat (but not uniformly) random uint32_t < aBound.
     * Not to be used for anything except ChaosMode, since it's not very random.
     */
    static uint32_t randomUint32LessThan(uint32_t aBound)
    {
      return uint32_t(rand()) % aBound;
    }
};

} /* namespace mozilla */

#endif /* mozilla_ChaosMode_h */