1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mfbt/ChaosMode.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,41 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim: set ts=8 sts=2 et sw=2 tw=80: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef mozilla_ChaosMode_h
1.11 +#define mozilla_ChaosMode_h
1.12 +
1.13 +#include <stdint.h>
1.14 +#include <stdlib.h>
1.15 +
1.16 +namespace mozilla {
1.17 +
1.18 +/**
1.19 + * When "chaos mode" is activated, code that makes implicitly nondeterministic
1.20 + * choices is encouraged to make random and extreme choices, to test more
1.21 + * code paths and uncover bugs.
1.22 + */
1.23 +class ChaosMode
1.24 +{
1.25 + public:
1.26 + static bool isActive()
1.27 + {
1.28 + // Flip this to true to activate chaos mode
1.29 + return false;
1.30 + }
1.31 +
1.32 + /**
1.33 + * Returns a somewhat (but not uniformly) random uint32_t < aBound.
1.34 + * Not to be used for anything except ChaosMode, since it's not very random.
1.35 + */
1.36 + static uint32_t randomUint32LessThan(uint32_t aBound)
1.37 + {
1.38 + return uint32_t(rand()) % aBound;
1.39 + }
1.40 +};
1.41 +
1.42 +} /* namespace mozilla */
1.43 +
1.44 +#endif /* mozilla_ChaosMode_h */
