ScrapHeap.h

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#pragma once
 
#include "RE/I/IMemoryStore.h"
 
#include "REX/W32/KERNEL32.h"
 
namespace RE
{
    class ScrapHeap : public IMemoryStore
    {
    public:
        inline static constexpr auto RTTI = RTTI_ScrapHeap;
 
        struct Block
        {
        public:
            // members
            std::size_t sizeFlags;  // 00
            Block*      prev;       // 08
        };
        static_assert(sizeof(Block) == 0x10);
 
        struct FreeBlock : public Block
        {
        public:
            // members
            FreeBlock* left;   // 10
            FreeBlock* right;  // 18
        };
        static_assert(sizeof(FreeBlock) == 0x20);
 
        struct FreeTreeNode : public Block
        {
        public:
            // members
            FreeTreeNode** root;            // 10
            FreeTreeNode*  leftNode;        // 18
            FreeTreeNode*  rightNode;       // 20
            std::size_t    parentAndBlack;  // 28
        };
        static_assert(sizeof(FreeTreeNode) == 0x30);
 
        ~ScrapHeap() override { REX::W32::VirtualFree(baseAddress, 0, REX::W32::MEM_RELEASE); }  // 00
 
        // override (IMemoryStore)
        std::size_t Size(void const* a_mem) const override { return *static_cast<const std::size_t*>(a_mem) & ~(std::size_t{ 3 } << 62); }  // 01
        void        GetMemoryStats(MemoryStats*) override { return; }                                                                       // 02
        bool        ContainsBlockImpl(const void* a_block) const override { return baseAddress <= a_block && a_block <= endAddress; }       // 03
        void*       AllocateAlignImpl(std::size_t a_size, std::uint32_t a_alignment) override { return Allocate(a_size, a_alignment); }     // 04
        void        DeallocateAlignImpl(void*& a_block) override { Deallocate(a_block), a_block = nullptr; }                                // 05
 
        void* Allocate(std::size_t a_size, std::size_t a_alignment);
        void  Deallocate(void* a_mem);
 
        // members
        FreeBlock*    smallBlocks[6]{ nullptr };  // 08
        FreeTreeNode* freeList{ nullptr };        // 38
        Block*        lastBlock{ nullptr };       // 40
        void*         baseAddress{ nullptr };     // 48
        void*         endAddress{ nullptr };      // 50
        void*         commitEnd{ nullptr };       // 58
        std::size_t   reserveSize{ 1 << 26 };     // 60
        std::size_t   minCommit{ 1 << 17 };       // 68
        std::size_t   totalAllocated{ 0 };        // 70
        std::uint32_t keepPagesRequest{ 0 };      // 78
        std::uint32_t totalFreeBlocks{ 0 };       // 7C
        std::uint32_t freeSmallBlocks{ 0 };       // 80
        std::uint32_t totalAllocatedBlocks{ 0 };  // 84
        std::uint32_t pmpBarrier{ 0 };            // 88
    };
    static_assert(sizeof(ScrapHeap) == 0x90);
}