common: Add VirtualBuffer class, to abstract memory virtualization.
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@ -155,6 +155,8 @@ add_library(common STATIC
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uuid.cpp
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uuid.h
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vector_math.h
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virtual_buffer.cpp
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virtual_buffer.h
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web_result.h
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zstd_compression.cpp
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zstd_compression.h
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@ -0,0 +1,52 @@
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// Copyright 2020 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <stdio.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#if defined __APPLE__ || defined __FreeBSD__ || defined __OpenBSD__
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#include <sys/sysctl.h>
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#elif defined __HAIKU__
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#include <OS.h>
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#else
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#include <sys/sysinfo.h>
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#endif
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#endif
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#include "common/assert.h"
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#include "common/virtual_buffer.h"
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namespace Common {
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void* AllocateMemoryPages(std::size_t size) {
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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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void* base{mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0)};
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if (base == MAP_FAILED) {
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base = nullptr;
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}
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#endif
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ASSERT(base);
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return base;
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}
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void FreeMemoryPages(void* base, std::size_t size) {
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if (!base) {
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return;
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}
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#ifdef _WIN32
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ASSERT(VirtualFree(base, 0, MEM_RELEASE));
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#else
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ASSERT(munmap(base, size) == 0);
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#endif
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}
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} // namespace Common
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@ -0,0 +1,58 @@
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// Copyright 2020 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include "common/common_funcs.h"
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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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template <typename T>
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class VirtualBuffer final : NonCopyable {
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public:
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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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FreeMemoryPages(base_ptr, alloc_size);
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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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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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constexpr const T& operator[](std::size_t index) const {
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return base_ptr[index];
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}
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constexpr T& operator[](std::size_t index) {
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return base_ptr[index];
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}
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constexpr T* data() {
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return base_ptr;
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}
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constexpr const T* data() const {
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return base_ptr;
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}
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constexpr std::size_t size() const {
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return alloc_size / sizeof(T);
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}
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private:
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std::size_t alloc_size{};
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T* base_ptr{};
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};
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} // namespace Common
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