diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt index eeceaa655..6ffc612e7 100644 --- a/src/common/CMakeLists.txt +++ b/src/common/CMakeLists.txt @@ -155,6 +155,8 @@ add_library(common STATIC uuid.cpp uuid.h vector_math.h + virtual_buffer.cpp + virtual_buffer.h web_result.h zstd_compression.cpp zstd_compression.h diff --git a/src/common/virtual_buffer.cpp b/src/common/virtual_buffer.cpp new file mode 100644 index 000000000..b426f4747 --- /dev/null +++ b/src/common/virtual_buffer.cpp @@ -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 +#else +#include +#include +#include +#if defined __APPLE__ || defined __FreeBSD__ || defined __OpenBSD__ +#include +#elif defined __HAIKU__ +#include +#else +#include +#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 diff --git a/src/common/virtual_buffer.h b/src/common/virtual_buffer.h new file mode 100644 index 000000000..da064e59e --- /dev/null +++ b/src/common/virtual_buffer.h @@ -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 +class VirtualBuffer final : NonCopyable { +public: + constexpr VirtualBuffer() = default; + explicit VirtualBuffer(std::size_t count) : alloc_size{count * sizeof(T)} { + base_ptr = reinterpret_cast(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(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