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Copy pathSuperRegion.cpp
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83 lines (72 loc) · 2.83 KB
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/*
* Copyright (C) 2013 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.
*/
#include "config.h"
#include "SuperRegion.h"
#include "JSCInlines.h"
#include "Region.h"
namespace JSC {
const uint64_t SuperRegion::s_fixedHeapMemoryPoolSize = 4 * 1024 * static_cast<uint64_t>(MB);
SuperRegion::SuperRegion()
: MetaAllocator(Region::s_regionSize, Region::s_regionSize)
, m_reservationBase(0)
{
#if ENABLE(SUPER_REGION)
// Over-allocate so that we can make sure that we're aligned to the size of Regions.
m_reservation = PageReservation::reserve(s_fixedHeapMemoryPoolSize + Region::s_regionSize, OSAllocator::JSGCHeapPages);
m_reservationBase = getAlignedBase(m_reservation);
addFreshFreeSpace(m_reservationBase, s_fixedHeapMemoryPoolSize);
#else
UNUSED_PARAM(m_reservation);
UNUSED_PARAM(m_reservationBase);
#endif
}
SuperRegion::~SuperRegion()
{
#if ENABLE(SUPER_REGION)
m_reservation.deallocate();
#endif
}
void* SuperRegion::getAlignedBase(PageReservation& reservation)
{
for (char* current = static_cast<char*>(reservation.base()); current < static_cast<char*>(reservation.base()) + Region::s_regionSize; current += pageSize()) {
if (!(reinterpret_cast<size_t>(current) & ~Region::s_regionMask))
return current;
}
ASSERT_NOT_REACHED();
return 0;
}
void* SuperRegion::allocateNewSpace(size_t&)
{
return 0;
}
void SuperRegion::notifyNeedPage(void* page)
{
m_reservation.commit(page, Region::s_regionSize);
}
void SuperRegion::notifyPageIsFree(void* page)
{
m_reservation.decommit(page, Region::s_regionSize);
}
} // namespace JSC