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// Copyright 2026 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <cstddef>
#include "Common/Assert.h"
#include "Common/MemArena.h"
namespace Common
{
// A bit set backed by a LazyMemoryRegion.
class LazyMemoryRegionBitSet final
{
public:
// Allocates backing memory and creates a bit set.
// Allocating backing memory may fail; use IsValid to check for success.
LazyMemoryRegionBitSet(size_t bits);
bool IsValid() const { return m_valid; }
void Clear();
bool TestBit(size_t bit) const
{
CheckBitIndexReadable(bit);
return (m_pointer[bit / 32] & (1 << (bit % 32))) != 0;
}
void SetBit(size_t bit)
{
CheckBitIndexWriteable(bit);
m_region.EnsureMemoryPageWritable(bit / 8);
m_pointer[bit / 32] |= (1 << (bit % 32));
}
void ClearBit(size_t bit)
{
CheckBitIndexWriteable(bit);
m_region.EnsureMemoryPageWritable(bit / 8);
m_pointer[bit / 32] &= ~(1 << (bit % 32));
}
void SetBits(size_t bits_start, size_t bits_end);
void ClearBits(size_t bits_start, size_t bits_end);
const u32* GetRawMemory() const { return m_pointer; }
private:
LazyMemoryRegion m_region;
u32* m_pointer;
size_t m_bits;
bool m_valid;
bool Create(size_t bits);
void CheckBitIndexReadable(size_t bit) const
{
DEBUG_ASSERT_MSG(COMMON, m_valid, "LazyMemoryRegionBitSet isn't valid");
DEBUG_ASSERT_MSG(COMMON, bit < m_bits,
"Tried to access bit {} in a LazyMemoryRegionBitSet with only {} bits", bit,
m_bits);
}
void CheckBitIndexWriteable(size_t bit)
{
CheckBitIndexReadable(bit);
m_region.EnsureMemoryPageWritable(bit / 8);
}
void CheckBitIndicesWriteable(size_t bits_start, size_t bits_end);
};
} // namespace Common
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