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// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <mutex>
#include <boost/icl/interval_set.hpp>
namespace Common {
class FreeRegionManager {
public:
explicit FreeRegionManager() = default;
~FreeRegionManager() = default;
void SetAddressSpace(void* start, size_t size) {
this->FreeBlock(start, size);
}
std::pair<void*, size_t> FreeBlock(void* block_ptr, size_t size) {
std::scoped_lock lk(m_mutex);
// Check to see if we are adjacent to any regions.
auto start_address = reinterpret_cast<uintptr_t>(block_ptr);
auto end_address = start_address + size;
auto it = m_free_regions.find({start_address - 1, end_address + 1});
// If we are, join with them, ensuring we stay in bounds.
if (it != m_free_regions.end()) {
start_address = std::min(start_address, it->lower());
end_address = std::max(end_address, it->upper());
}
// Free the relevant region.
m_free_regions.insert({start_address, end_address});
// Return the adjusted pointers.
block_ptr = reinterpret_cast<void*>(start_address);
size = end_address - start_address;
return {block_ptr, size};
}
void AllocateBlock(void* block_ptr, size_t size) {
std::scoped_lock lk(m_mutex);
auto address = reinterpret_cast<uintptr_t>(block_ptr);
m_free_regions.subtract({address, address + size});
}
private:
std::mutex m_mutex;
boost::icl::interval_set<uintptr_t> m_free_regions;
};
} // namespace Common
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