| /* |
| * 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. ``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 |
| * 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 "BInline.h" |
| #include "EligibilityResult.h" |
| #include "IsoAllocator.h" |
| #include "IsoHeapImplInlines.h" |
| #include "IsoPage.h" |
| |
| namespace bmalloc { |
| |
| template<typename Config> |
| IsoAllocator<Config>::IsoAllocator(IsoHeapImpl<Config>&) |
| { |
| } |
| |
| template<typename Config> |
| IsoAllocator<Config>::~IsoAllocator() |
| { |
| } |
| |
| template<typename Config> |
| void* IsoAllocator<Config>::allocate(IsoHeapImpl<Config>& heap, bool abortOnFailure) |
| { |
| static constexpr bool verbose = false; |
| void* result = m_freeList.allocate<Config>( |
| [&] () -> void* { |
| return allocateSlow(heap, abortOnFailure); |
| }); |
| if (verbose) |
| fprintf(stderr, "%p: allocated %p of size %u\n", &heap, result, Config::objectSize); |
| return result; |
| } |
| |
| template<typename Config> |
| BNO_INLINE void* IsoAllocator<Config>::allocateSlow(IsoHeapImpl<Config>& heap, bool abortOnFailure) |
| { |
| LockHolder locker(heap.lock); |
| |
| AllocationMode allocationMode = heap.updateAllocationMode(); |
| if (allocationMode == AllocationMode::Shared) { |
| if (m_currentPage) { |
| m_currentPage->stopAllocating(locker, m_freeList); |
| m_currentPage = nullptr; |
| m_freeList.clear(); |
| } |
| return heap.allocateFromShared(locker, abortOnFailure); |
| } |
| |
| BASSERT(allocationMode == AllocationMode::Fast); |
| |
| EligibilityResult<Config> result = heap.takeFirstEligible(locker); |
| if (result.kind != EligibilityKind::Success) { |
| RELEASE_BASSERT(result.kind == EligibilityKind::OutOfMemory); |
| RELEASE_BASSERT(!abortOnFailure); |
| return nullptr; |
| } |
| |
| if (m_currentPage) |
| m_currentPage->stopAllocating(locker, m_freeList); |
| |
| m_currentPage = result.page; |
| m_freeList = m_currentPage->startAllocating(locker); |
| |
| return m_freeList.allocate<Config>([] () { BCRASH(); return nullptr; }); |
| } |
| |
| template<typename Config> |
| void IsoAllocator<Config>::scavenge(IsoHeapImpl<Config>& heap) |
| { |
| if (m_currentPage) { |
| LockHolder locker(heap.lock); |
| m_currentPage->stopAllocating(locker, m_freeList); |
| m_currentPage = nullptr; |
| m_freeList.clear(); |
| } |
| } |
| |
| } // namespace bmalloc |
| |