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Copy pathCorpseRegion.cpp
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75 lines (65 loc) · 3.03 KB
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/*
* Copyright (C) 2026 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 "CorpseRegion.h"
#if (OS(MACOS) || USE(APPLE_INTERNAL_SDK)) && !PLATFORM(MACCATALYST) && !PLATFORM(IOS_FAMILY_SIMULATOR)
#include <mach/mach_vm.h>
namespace JSC {
namespace Corpse {
uint64_t Region::pageCount() const
{
return vm_kernel_page_size ? m_size / vm_kernel_page_size : 0;
}
std::optional<Region> Region::findContaining(mach_port_t task, Address address)
{
// mach_vm_region_recurse reports the region at or above the address it is given,
// so the result only describes `address` if it turns out to contain it.
mach_vm_address_t regionAddress = 0;
mach_vm_size_t regionSize = 0;
vm_region_submap_info_data_64_t info;
for (natural_t depth = 0; ; ++depth) {
regionAddress = address.toMachVMAddress();
regionSize = 0;
natural_t depthLimit = depth; // We tell the kernel how deep we want to go. Kernel tells us how deep it can go.
mach_msg_type_number_t infoCount = VM_REGION_SUBMAP_INFO_COUNT_64;
kern_return_t kr = mach_vm_region_recurse(task, ®ionAddress, ®ionSize,
&depthLimit, reinterpret_cast<vm_region_recurse_info_t>(&info), &infoCount);
if (kr != KERN_SUCCESS)
return std::nullopt;
if (!info.is_submap)
break;
}
Region region;
region.m_base = Address(regionAddress);
region.m_size = static_cast<size_t>(regionSize);
if (!region.contains(address))
return std::nullopt;
region.m_residentPageCount = info.pages_resident;
region.m_dirtyPageCount = info.pages_dirtied;
return region;
}
} // namespace Corpse
} // namespace JSC
#endif // (OS(MACOS) || USE(APPLE_INTERNAL_SDK)) && !PLATFORM(MACCATALYST) && !PLATFORM(IOS_FAMILY_SIMULATOR)