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/*
* Copyright (C) 2025 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
#include <wtf/CheckedArithmetic.h>
#include <wtf/WeakPtr.h>
namespace WebCore {
class LocalFrame;
class FrameMemoryMonitor final : public RefCounted<FrameMemoryMonitor> {
public:
static Ref<FrameMemoryMonitor> create(const LocalFrame&);
WEBCORE_EXPORT ~FrameMemoryMonitor() = default;
WEBCORE_EXPORT void setUsage(size_t);
WEBCORE_EXPORT void lowerAllMemoryLimitsForTesting();
private:
explicit FrameMemoryMonitor(const LocalFrame&);
void checkMemoryPressureAndUnloadFrameIfNeeded();
void unloadFrameAndShowMemoryMonitorError();
WeakPtr<LocalFrame> m_frame;
CheckedSize m_currentMemoryUsage;
bool m_usageHasExceeded { false };
// FIXME: Add platform specific memory limits
size_t m_maxMemoryAllowedPerFrame = { 1 * GB };
unsigned m_exceedCount = { 0 };
unsigned m_memoryPressureConsecutiveLimit = { 3 };
};
} // namespace WebCore
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