blob: 287050eb3ee420b5ac7190f3be2876d5d9051348 [file] [log] [blame]
/*
* Copyright (C) 2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
*/
#pragma once
namespace WebCore {
class LayoutDisallowedScope {
public:
enum class Reason { PerformanceOptimization, ReentrancyAvoidance };
#if !ASSERT_ENABLED
LayoutDisallowedScope(Reason) { }
static bool isLayoutAllowed() { return true; }
#else // ASSERT_ENABLED
LayoutDisallowedScope(Reason)
: m_previousAssertion(s_currentAssertion)
{
s_currentAssertion = this;
}
~LayoutDisallowedScope()
{
s_currentAssertion = m_previousAssertion;
}
static bool isLayoutAllowed() { return !s_currentAssertion; }
private:
LayoutDisallowedScope* m_previousAssertion;
static LayoutDisallowedScope* s_currentAssertion;
#endif // ASSERT_ENABLED
};
}