105 lines
3.4 KiB
C++
105 lines
3.4 KiB
C++
/*
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* Copyright (C) 2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "BInline.h"
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#include "EligibilityResult.h"
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#include "IsoAllocator.h"
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#include "IsoHeapImplInlines.h"
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#include "IsoPage.h"
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namespace bmalloc {
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template<typename Config>
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IsoAllocator<Config>::IsoAllocator(IsoHeapImpl<Config>&)
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{
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}
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template<typename Config>
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IsoAllocator<Config>::~IsoAllocator()
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{
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}
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template<typename Config>
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void* IsoAllocator<Config>::allocate(IsoHeapImpl<Config>& heap, bool abortOnFailure)
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{
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static constexpr bool verbose = false;
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void* result = m_freeList.allocate<Config>(
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[&] () -> void* {
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return allocateSlow(heap, abortOnFailure);
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});
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if (verbose)
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fprintf(stderr, "%p: allocated %p of size %u\n", &heap, result, Config::objectSize);
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return result;
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}
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template<typename Config>
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BNO_INLINE void* IsoAllocator<Config>::allocateSlow(IsoHeapImpl<Config>& heap, bool abortOnFailure)
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{
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LockHolder locker(heap.lock);
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AllocationMode allocationMode = heap.updateAllocationMode();
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if (allocationMode == AllocationMode::Shared) {
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if (m_currentPage) {
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m_currentPage->stopAllocating(locker, m_freeList);
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m_currentPage = nullptr;
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m_freeList.clear();
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}
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return heap.allocateFromShared(locker, abortOnFailure);
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}
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BASSERT(allocationMode == AllocationMode::Fast);
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EligibilityResult<Config> result = heap.takeFirstEligible(locker);
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if (result.kind != EligibilityKind::Success) {
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RELEASE_BASSERT(result.kind == EligibilityKind::OutOfMemory);
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RELEASE_BASSERT(!abortOnFailure);
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return nullptr;
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}
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if (m_currentPage)
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m_currentPage->stopAllocating(locker, m_freeList);
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m_currentPage = result.page;
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m_freeList = m_currentPage->startAllocating(locker);
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return m_freeList.allocate<Config>([] () { BCRASH(); return nullptr; });
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}
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template<typename Config>
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void IsoAllocator<Config>::scavenge(IsoHeapImpl<Config>& heap)
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{
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if (m_currentPage) {
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LockHolder locker(heap.lock);
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m_currentPage->stopAllocating(locker, m_freeList);
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m_currentPage = nullptr;
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m_freeList.clear();
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}
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}
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} // namespace bmalloc
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