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