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https://github.com/RetroDECK/Duckstation.git
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75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
#pragma once
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#include "types.h"
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#include <atomic>
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#include <optional>
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namespace Common {
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class MemoryArena
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{
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public:
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class View
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{
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public:
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enum : size_t
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{
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RESERVED_REGION_OFFSET = static_cast<size_t>(-1)
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};
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View(MemoryArena* parent, void* base_pointer, size_t arena_offset, size_t mapping_size, bool writable);
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View(View&& view);
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~View();
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void* GetBasePointer() const { return m_base_pointer; }
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size_t GetArenaOffset() const { return m_arena_offset; }
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size_t GetMappingSize() const { return m_mapping_size; }
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bool IsWritable() const { return m_writable; }
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private:
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MemoryArena* m_parent;
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void* m_base_pointer;
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size_t m_arena_offset;
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size_t m_mapping_size;
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bool m_writable;
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};
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MemoryArena();
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~MemoryArena();
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static void* FindBaseAddressForMapping(size_t size);
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ALWAYS_INLINE size_t GetSize() const { return m_size; }
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ALWAYS_INLINE bool IsWritable() const { return m_writable; }
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ALWAYS_INLINE bool IsExecutable() const { return m_executable; }
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bool IsValid() const;
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bool Create(size_t size, bool writable, bool executable);
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void Destroy();
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std::optional<View> CreateView(size_t offset, size_t size, bool writable, bool executable,
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void* fixed_address = nullptr);
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std::optional<View> CreateReservedView(size_t size, void* fixed_address = nullptr);
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void* CreateViewPtr(size_t offset, size_t size, bool writable, bool executable, void* fixed_address = nullptr);
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bool FlushViewPtr(void* address, size_t size);
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bool ReleaseViewPtr(void* address, size_t size);
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void* CreateReservedPtr(size_t size, void* fixed_address = nullptr);
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bool ReleaseReservedPtr(void* address, size_t size);
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static bool SetPageProtection(void* address, size_t length, bool readable, bool writable, bool executable);
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private:
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#if defined(_WIN32)
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void* m_file_handle = nullptr;
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#elif defined(__linux__) || defined(ANDROID) || defined(__APPLE__) || defined(__FreeBSD__)
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int m_shmem_fd = -1;
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#endif
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std::atomic_size_t m_num_views{0};
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size_t m_size = 0;
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bool m_writable = false;
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bool m_executable = false;
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};
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} // namespace Common
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