Merge pull request #4936 from lioncash/page

page_table: Allow page tables to be moved
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bunnei 2020-11-18 20:40:10 -08:00 committed by GitHub
commit 92344da20c
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4 changed files with 37 additions and 12 deletions

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@ -8,7 +8,7 @@ namespace Common {
PageTable::PageTable() = default;
PageTable::~PageTable() = default;
PageTable::~PageTable() noexcept = default;
void PageTable::Resize(std::size_t address_space_width_in_bits, std::size_t page_size_in_bits,
bool has_attribute) {

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@ -4,9 +4,7 @@
#pragma once
#include <vector>
#include <boost/icl/interval_map.hpp>
#include <tuple>
#include "common/common_types.h"
#include "common/memory_hook.h"
@ -51,13 +49,21 @@ struct SpecialRegion {
*/
struct PageTable {
PageTable();
~PageTable();
~PageTable() noexcept;
PageTable(const PageTable&) = delete;
PageTable& operator=(const PageTable&) = delete;
PageTable(PageTable&&) noexcept = default;
PageTable& operator=(PageTable&&) noexcept = default;
/**
* Resizes the page table to be able to accomodate enough pages within
* a given address space.
*
* @param address_space_width_in_bits The address size width in bits.
* @param page_size_in_bits The page size in bits.
* @param has_attribute Whether or not this page has any backing attributes.
*/
void Resize(std::size_t address_space_width_in_bits, std::size_t page_size_in_bits,
bool has_attribute);

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@ -13,7 +13,7 @@
namespace Common {
void* AllocateMemoryPages(std::size_t size) {
void* AllocateMemoryPages(std::size_t size) noexcept {
#ifdef _WIN32
void* base{VirtualAlloc(nullptr, size, MEM_COMMIT, PAGE_READWRITE)};
#else
@ -29,7 +29,7 @@ void* AllocateMemoryPages(std::size_t size) {
return base;
}
void FreeMemoryPages(void* base, [[maybe_unused]] std::size_t size) {
void FreeMemoryPages(void* base, [[maybe_unused]] std::size_t size) noexcept {
if (!base) {
return;
}

View file

@ -4,25 +4,44 @@
#pragma once
#include "common/common_funcs.h"
#include <type_traits>
#include <utility>
namespace Common {
void* AllocateMemoryPages(std::size_t size);
void FreeMemoryPages(void* base, std::size_t size);
void* AllocateMemoryPages(std::size_t size) noexcept;
void FreeMemoryPages(void* base, std::size_t size) noexcept;
template <typename T>
class VirtualBuffer final : NonCopyable {
class VirtualBuffer final {
public:
static_assert(
std::is_trivially_constructible_v<T>,
"T must be trivially constructible, as non-trivial constructors will not be executed "
"with the current allocator");
constexpr VirtualBuffer() = default;
explicit VirtualBuffer(std::size_t count) : alloc_size{count * sizeof(T)} {
base_ptr = reinterpret_cast<T*>(AllocateMemoryPages(alloc_size));
}
~VirtualBuffer() {
~VirtualBuffer() noexcept {
FreeMemoryPages(base_ptr, alloc_size);
}
VirtualBuffer(const VirtualBuffer&) = delete;
VirtualBuffer& operator=(const VirtualBuffer&) = delete;
VirtualBuffer(VirtualBuffer&& other) noexcept
: alloc_size{std::exchange(other.alloc_size, 0)}, base_ptr{std::exchange(other.base_ptr),
nullptr} {}
VirtualBuffer& operator=(VirtualBuffer&& other) noexcept {
alloc_size = std::exchange(other.alloc_size, 0);
base_ptr = std::exchange(other.base_ptr, nullptr);
return *this;
}
void resize(std::size_t count) {
FreeMemoryPages(base_ptr, alloc_size);