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