common: Add VirtualBuffer class, to abstract memory virtualization.

This commit is contained in:
bunnei 2020-04-08 17:35:07 -04:00
parent a238d08f71
commit 4ba2428c86
3 changed files with 112 additions and 0 deletions

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@ -155,6 +155,8 @@ add_library(common STATIC
uuid.cpp uuid.cpp
uuid.h uuid.h
vector_math.h vector_math.h
virtual_buffer.cpp
virtual_buffer.h
web_result.h web_result.h
zstd_compression.cpp zstd_compression.cpp
zstd_compression.h zstd_compression.h

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@ -0,0 +1,52 @@
// Copyright 2020 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#ifdef _WIN32
#include <windows.h>
#else
#include <stdio.h>
#include <sys/mman.h>
#include <sys/types.h>
#if defined __APPLE__ || defined __FreeBSD__ || defined __OpenBSD__
#include <sys/sysctl.h>
#elif defined __HAIKU__
#include <OS.h>
#else
#include <sys/sysinfo.h>
#endif
#endif
#include "common/assert.h"
#include "common/virtual_buffer.h"
namespace Common {
void* AllocateMemoryPages(std::size_t size) {
#ifdef _WIN32
void* base{VirtualAlloc(nullptr, size, MEM_COMMIT, PAGE_READWRITE)};
#else
void* base{mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0)};
if (base == MAP_FAILED) {
base = nullptr;
}
#endif
ASSERT(base);
return base;
}
void FreeMemoryPages(void* base, std::size_t size) {
if (!base) {
return;
}
#ifdef _WIN32
ASSERT(VirtualFree(base, 0, MEM_RELEASE));
#else
ASSERT(munmap(base, size) == 0);
#endif
}
} // namespace Common

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@ -0,0 +1,58 @@
// Copyright 2020 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include "common/common_funcs.h"
namespace Common {
void* AllocateMemoryPages(std::size_t size);
void FreeMemoryPages(void* base, std::size_t size);
template <typename T>
class VirtualBuffer final : NonCopyable {
public:
constexpr VirtualBuffer() = default;
explicit VirtualBuffer(std::size_t count) : alloc_size{count * sizeof(T)} {
base_ptr = reinterpret_cast<T*>(AllocateMemoryPages(alloc_size));
}
~VirtualBuffer() {
FreeMemoryPages(base_ptr, alloc_size);
}
void resize(std::size_t count) {
FreeMemoryPages(base_ptr, alloc_size);
alloc_size = count * sizeof(T);
base_ptr = reinterpret_cast<T*>(AllocateMemoryPages(alloc_size));
}
constexpr const T& operator[](std::size_t index) const {
return base_ptr[index];
}
constexpr T& operator[](std::size_t index) {
return base_ptr[index];
}
constexpr T* data() {
return base_ptr;
}
constexpr const T* data() const {
return base_ptr;
}
constexpr std::size_t size() const {
return alloc_size / sizeof(T);
}
private:
std::size_t alloc_size{};
T* base_ptr{};
};
} // namespace Common