76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
/*
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* Copyright (C) 2018 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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#if ENABLE_PHYSICAL_PAGE_MAP
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#include "VMAllocate.h"
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#include <unordered_set>
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namespace bmalloc {
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// This class is useful for debugging bmalloc's footprint.
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class PhysicalPageMap {
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public:
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void commit(void* ptr, size_t size)
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{
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forEachPhysicalPage(ptr, size, [&] (void* ptr) {
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m_physicalPages.insert(ptr);
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});
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}
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void decommit(void* ptr, size_t size)
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{
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forEachPhysicalPage(ptr, size, [&] (void* ptr) {
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m_physicalPages.erase(ptr);
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});
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}
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size_t footprint()
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{
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return static_cast<size_t>(m_physicalPages.size()) * vmPageSizePhysical();
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}
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private:
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template <typename F>
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void forEachPhysicalPage(void* ptr, size_t size, F f)
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{
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char* begin = roundUpToMultipleOf(vmPageSizePhysical(), static_cast<char*>(ptr));
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char* end = roundDownToMultipleOf(vmPageSizePhysical(), static_cast<char*>(ptr) + size);
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while (begin < end) {
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f(begin);
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begin += vmPageSizePhysical();
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}
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}
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std::unordered_set<void*> m_physicalPages;
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};
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} // namespace bmalloc
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#endif // ENABLE_PHYSICAL_PAGE_MAP
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