yuzu-android/src/video_core/rasterizer_accelerated.h
comex d7c532d889 Fixes and workarounds to make UBSan happier on macOS
There are still some other issues not addressed here, but it's a start.

Workarounds for false-positive reports:

- `RasterizerAccelerated`: Put a gigantic array behind a `unique_ptr`,
  because UBSan has a [hardcoded limit](https://stackoverflow.com/questions/64531383/c-runtime-error-using-fsanitize-undefined-object-has-a-possibly-invalid-vp)
  of how big it thinks objects can be, specifically when dealing with
  offset-to-top values used with multiple inheritance.  Hopefully this
  doesn't have a performance impact.

- `QueryCacheBase::QueryCacheBase`: Avoid an operation that UBSan thinks
  is UB even though it at least arguably isn't.  See the link in the
  comment for more information.

Fixes for correct reports:

- `PageTable`, `Memory`: Use `uintptr_t` values instead of pointers to
  avoid UB from pointer overflow (when pointer arithmetic wraps around
  the address space).

- `KScheduler::Reload`: `thread->GetOwnerProcess()` can be `nullptr`;
  avoid calling methods on it in this case.  (The existing code returns
  a garbage reference to a field, which is then passed into
  `LoadWatchpointArray`, and apparently it's never used, so it's
  harmless in practice but still triggers UBSan.)

- `KAutoObject::Close`: This function calls `this->Destroy()`, which
  overwrites the beginning of the object with junk (specifically a free
  list pointer).  Then it calls `this->UnregisterWithKernel()`.  UBSan
  complains about a type mismatch because the vtable has been
  overwritten, and I believe this is indeed UB.  `UnregisterWithKernel`
  also loads `m_kernel` from the 'freed' object, which seems to be
  technically safe (the overwriting doesn't extend as far as that
  field), but seems dubious.  Switch to a `static` method and load
  `m_kernel` in advance.
2023-07-15 12:00:28 -07:00

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C++

// SPDX-FileCopyrightText: Copyright 2019 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <array>
#include <atomic>
#include "common/common_types.h"
#include "video_core/rasterizer_interface.h"
namespace Core::Memory {
class Memory;
}
namespace VideoCore {
/// Implements the shared part in GPU accelerated rasterizers in RasterizerInterface.
class RasterizerAccelerated : public RasterizerInterface {
public:
explicit RasterizerAccelerated(Core::Memory::Memory& cpu_memory_);
~RasterizerAccelerated() override;
void UpdatePagesCachedCount(VAddr addr, u64 size, int delta) override;
private:
class CacheEntry final {
public:
CacheEntry() = default;
std::atomic_uint16_t& Count(std::size_t page) {
return values[page & 3];
}
const std::atomic_uint16_t& Count(std::size_t page) const {
return values[page & 3];
}
private:
std::array<std::atomic_uint16_t, 4> values{};
};
static_assert(sizeof(CacheEntry) == 8, "CacheEntry should be 8 bytes!");
using CachedPages = std::array<CacheEntry, 0x2000000>;
std::unique_ptr<CachedPages> cached_pages;
Core::Memory::Memory& cpu_memory;
};
} // namespace VideoCore