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// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <iterator>
#include <memory>
#include <optional>
#include <span>
#include <vector>
#include "common/assert.h"
#include "common/scratch_buffer.h"
namespace Core::Memory {
enum GuestMemoryFlags : u32 {
Read = 1 << 0,
Write = 1 << 1,
Safe = 1 << 2,
Cached = 1 << 3,
SafeRead = Read | Safe,
SafeWrite = Write | Safe,
SafeReadWrite = SafeRead | SafeWrite,
SafeReadCachedWrite = SafeReadWrite | Cached,
UnsafeRead = Read,
UnsafeWrite = Write,
UnsafeReadWrite = UnsafeRead | UnsafeWrite,
UnsafeReadCachedWrite = UnsafeReadWrite | Cached,
};
namespace {
template <typename M, typename T, GuestMemoryFlags FLAGS>
class GuestMemory {
using iterator = T*;
using const_iterator = const T*;
using value_type = T;
using element_type = T;
using iterator_category = std::contiguous_iterator_tag;
public:
GuestMemory() = delete;
explicit GuestMemory(M& memory, u64 addr, std::size_t size,
Common::ScratchBuffer<T>* backup = nullptr)
: m_memory{memory}, m_addr{addr}, m_size{size} {
static_assert(FLAGS & GuestMemoryFlags::Read || FLAGS & GuestMemoryFlags::Write);
if constexpr (FLAGS & GuestMemoryFlags::Read) {
Read(addr, size, backup);
}
}
~GuestMemory() = default;
T* data() noexcept {
return m_data_span.data();
}
const T* data() const noexcept {
return m_data_span.data();
}
size_t size() const noexcept {
return m_size;
}
size_t size_bytes() const noexcept {
return this->size() * sizeof(T);
}
[[nodiscard]] T* begin() noexcept {
return this->data();
}
[[nodiscard]] const T* begin() const noexcept {
return this->data();
}
[[nodiscard]] T* end() noexcept {
return this->data() + this->size();
}
[[nodiscard]] const T* end() const noexcept {
return this->data() + this->size();
}
T& operator[](size_t index) noexcept {
return m_data_span[index];
}
const T& operator[](size_t index) const noexcept {
return m_data_span[index];
}
void SetAddressAndSize(u64 addr, std::size_t size) noexcept {
m_addr = addr;
m_size = size;
m_addr_changed = true;
}
std::span<T> Read(u64 addr, std::size_t size,
Common::ScratchBuffer<T>* backup = nullptr) noexcept {
m_addr = addr;
m_size = size;
if (m_size == 0) {
m_is_data_copy = true;
return {};
}
if (this->TrySetSpan()) {
if constexpr (FLAGS & GuestMemoryFlags::Safe) {
m_memory.FlushRegion(m_addr, this->size_bytes());
}
} else {
if (backup) {
backup->resize_destructive(this->size());
m_data_span = *backup;
} else {
m_data_copy.resize(this->size());
m_data_span = std::span(m_data_copy);
}
m_is_data_copy = true;
m_span_valid = true;
if constexpr (FLAGS & GuestMemoryFlags::Safe) {
m_memory.ReadBlock(m_addr, this->data(), this->size_bytes());
} else {
m_memory.ReadBlockUnsafe(m_addr, this->data(), this->size_bytes());
}
}
return m_data_span;
}
void Write(std::span<T> write_data) noexcept {
if constexpr (FLAGS & GuestMemoryFlags::Cached) {
m_memory.WriteBlockCached(m_addr, write_data.data(), this->size_bytes());
} else if constexpr (FLAGS & GuestMemoryFlags::Safe) {
m_memory.WriteBlock(m_addr, write_data.data(), this->size_bytes());
} else {
m_memory.WriteBlockUnsafe(m_addr, write_data.data(), this->size_bytes());
}
}
bool TrySetSpan() noexcept {
if (u8* ptr = m_memory.GetSpan(m_addr, this->size_bytes()); ptr) {
m_data_span = {reinterpret_cast<T*>(ptr), this->size()};
m_span_valid = true;
return true;
}
return false;
}
protected:
bool IsDataCopy() const noexcept {
return m_is_data_copy;
}
bool AddressChanged() const noexcept {
return m_addr_changed;
}
M& m_memory;
u64 m_addr{};
size_t m_size{};
std::span<T> m_data_span{};
std::vector<T> m_data_copy{};
bool m_span_valid{false};
bool m_is_data_copy{false};
bool m_addr_changed{false};
};
template <typename M, typename T, GuestMemoryFlags FLAGS>
class GuestMemoryScoped : public GuestMemory<M, T, FLAGS> {
public:
GuestMemoryScoped() = delete;
explicit GuestMemoryScoped(M& memory, u64 addr, std::size_t size,
Common::ScratchBuffer<T>* backup = nullptr)
: GuestMemory<M, T, FLAGS>(memory, addr, size, backup) {
if constexpr (!(FLAGS & GuestMemoryFlags::Read)) {
if (!this->TrySetSpan()) {
if (backup) {
this->m_data_span = *backup;
this->m_span_valid = true;
this->m_is_data_copy = true;
}
}
}
}
~GuestMemoryScoped() {
if constexpr (FLAGS & GuestMemoryFlags::Write) {
if (this->size() == 0) [[unlikely]] {
return;
}
if (this->AddressChanged() || this->IsDataCopy()) {
ASSERT(this->m_span_valid);
if constexpr (FLAGS & GuestMemoryFlags::Cached) {
this->m_memory.WriteBlockCached(this->m_addr, this->data(), this->size_bytes());
} else if constexpr (FLAGS & GuestMemoryFlags::Safe) {
this->m_memory.WriteBlock(this->m_addr, this->data(), this->size_bytes());
} else {
this->m_memory.WriteBlockUnsafe(this->m_addr, this->data(), this->size_bytes());
}
} else if constexpr ((FLAGS & GuestMemoryFlags::Safe) ||
(FLAGS & GuestMemoryFlags::Cached)) {
this->m_memory.InvalidateRegion(this->m_addr, this->size_bytes());
}
}
}
};
} // namespace
} // namespace Core::Memory
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