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Merge pull request #4936 from lioncash/page
page_table: Allow page tables to be moved
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commit
92344da20c
@ -8,7 +8,7 @@ namespace Common {
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PageTable::PageTable() = default;
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PageTable::~PageTable() = default;
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PageTable::~PageTable() noexcept = default;
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void PageTable::Resize(std::size_t address_space_width_in_bits, std::size_t page_size_in_bits,
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bool has_attribute) {
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@ -4,9 +4,7 @@
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#pragma once
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#include <vector>
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#include <boost/icl/interval_map.hpp>
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#include <tuple>
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#include "common/common_types.h"
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#include "common/memory_hook.h"
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@ -51,13 +49,21 @@ struct SpecialRegion {
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*/
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struct PageTable {
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PageTable();
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~PageTable();
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~PageTable() noexcept;
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PageTable(const PageTable&) = delete;
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PageTable& operator=(const PageTable&) = delete;
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PageTable(PageTable&&) noexcept = default;
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PageTable& operator=(PageTable&&) noexcept = default;
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/**
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* Resizes the page table to be able to accomodate enough pages within
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* a given address space.
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*
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* @param address_space_width_in_bits The address size width in bits.
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* @param page_size_in_bits The page size in bits.
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* @param has_attribute Whether or not this page has any backing attributes.
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*/
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void Resize(std::size_t address_space_width_in_bits, std::size_t page_size_in_bits,
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bool has_attribute);
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@ -13,7 +13,7 @@
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namespace Common {
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void* AllocateMemoryPages(std::size_t size) {
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void* AllocateMemoryPages(std::size_t size) noexcept {
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#ifdef _WIN32
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void* base{VirtualAlloc(nullptr, size, MEM_COMMIT, PAGE_READWRITE)};
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#else
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@ -29,7 +29,7 @@ void* AllocateMemoryPages(std::size_t size) {
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return base;
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}
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void FreeMemoryPages(void* base, [[maybe_unused]] std::size_t size) {
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void FreeMemoryPages(void* base, [[maybe_unused]] std::size_t size) noexcept {
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if (!base) {
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return;
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}
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@ -4,25 +4,44 @@
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#pragma once
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#include "common/common_funcs.h"
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#include <type_traits>
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#include <utility>
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namespace Common {
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void* AllocateMemoryPages(std::size_t size);
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void FreeMemoryPages(void* base, std::size_t size);
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void* AllocateMemoryPages(std::size_t size) noexcept;
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void FreeMemoryPages(void* base, std::size_t size) noexcept;
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template <typename T>
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class VirtualBuffer final : NonCopyable {
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class VirtualBuffer final {
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public:
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static_assert(
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std::is_trivially_constructible_v<T>,
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"T must be trivially constructible, as non-trivial constructors will not be executed "
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"with the current allocator");
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constexpr VirtualBuffer() = default;
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explicit VirtualBuffer(std::size_t count) : alloc_size{count * sizeof(T)} {
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base_ptr = reinterpret_cast<T*>(AllocateMemoryPages(alloc_size));
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}
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~VirtualBuffer() {
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~VirtualBuffer() noexcept {
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FreeMemoryPages(base_ptr, alloc_size);
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}
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VirtualBuffer(const VirtualBuffer&) = delete;
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VirtualBuffer& operator=(const VirtualBuffer&) = delete;
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VirtualBuffer(VirtualBuffer&& other) noexcept
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: alloc_size{std::exchange(other.alloc_size, 0)}, base_ptr{std::exchange(other.base_ptr),
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nullptr} {}
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VirtualBuffer& operator=(VirtualBuffer&& other) noexcept {
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alloc_size = std::exchange(other.alloc_size, 0);
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base_ptr = std::exchange(other.base_ptr, nullptr);
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return *this;
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}
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void resize(std::size_t count) {
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FreeMemoryPages(base_ptr, alloc_size);
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