AbstractHeap.h

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#pragma once
 
#include "RE/B/BSAtomic.h"
#include "RE/I/IMemoryHeap.h"
 
namespace RE
{
    class HeapBlock;
    class HeapBlockFreeHead;
 
    class AbstractHeap : public IMemoryHeap
    {
    public:
        inline static constexpr auto RTTI = RTTI_AbstractHeap;
        inline static constexpr auto VTABLE = VTABLE_AbstractHeap;
 
        virtual ~AbstractHeap();  // 00
 
        // override (IMemoryHeap)
        virtual void          GetMemoryStats(MemoryStats* a_stats) override;                                 // 02
        virtual void*         AllocateAlignImpl(std::size_t a_size, std::uint32_t a_alignment) override;     // 04
        virtual void*         TryAllocateImpl(std::size_t a_size, std::uint32_t a_alignment) override;       // 06
        virtual const char*   GetName() const override;                                                      // 07 - { return name; }
        virtual bool          PointerInHeap(const void* a_pointer) const override;                           // 0A
        virtual void          GetHeapStats(HeapStats* a_stats, bool a_fullBlockInfo) override;               // 0C
        virtual bool          ShouldTrySmallBlockPools(std::size_t a_size, MEM_CONTEXT a_context) override;  // 0D - { return true; }
        virtual std::uint32_t GetPageSize() const override;                                                  // 0E - { return pageSize; }
 
        // add
        virtual void*       DoHeapAllocation(std::size_t a_size, std::size_t a_initialSize) = 0;                       // 0F
        virtual void        DoHeapFree(void* a_ptr) = 0;                                                               // 10
        virtual std::size_t CreateMorePages(void* a_memory, std::size_t a_currentSize, std::size_t a_requestedBytes);  // 11 - { return 0; }
        virtual std::size_t CleanExtraPages(void* a_memory, std::size_t a_currentSize, std::size_t a_freeBytes);       // 12 - { return 0; }
        virtual void        DecommitPages(HeapBlock* a_block);                                                         // 13 - { return; }
        virtual void        CommitPages(HeapBlock*, std::size_t);                                                      // 14 - { return; }
 
        // members
        BSCriticalSection  criticalSection;     // 008
        const char*        name;                // 030
        std::size_t        minFreeBlockSize;    // 038
        std::uint32_t      pageSize;            // 040
        std::uint32_t      pageSizeFlag;        // 040
        std::size_t        memHeapSize;         // 048
        std::size_t        initialSize;         // 050
        std::size_t        currentSize;         // 058
        std::size_t        wastedMemory;        // 060
        std::size_t        memAllocated;        // 068
        std::size_t        memAllocatedHigh;    // 070
        std::size_t        blockMemAllocated;   // 078
        char*              memHeap;             // 080
        std::int32_t       numBlocks;           // 088
        std::uint32_t      pad08C;              // 08C
        HeapBlock*         blockHead;           // 090
        HeapBlock*         blockTail;           // 098
        std::int32_t       numFreeBlocks;       // 0A0
        bool               allowDecommits;      // 0A4
        bool               supportsSwapping;    // 0A5
        std::uint16_t      pad0A0;              // 0A6
        HeapBlock*         smallFreeLists[32];  // 0A8
        HeapBlockFreeHead* largeFreeTrees[32];  // 1A8
    private:
        KEEP_FOR_RE()
    };
    static_assert(sizeof(AbstractHeap) == 0x2A8);
}