// DataSegments for Red-Black Tree
union Data {
    struct Comparable { // interface
        enum Code compare;
        union Data* data;
    } compare;
    struct Count {
        enum Code next;
        long i;
    } count;
    struct Tree {
        enum Code next;
        struct Node* root;
        struct Node* current;
        struct Node* deleted;
        int result;
    } tree;
    struct Node {
        // need to tree
        enum Code next;
        int key; // comparable data segment
        int value;
        struct Node* left;
        struct Node* right;
        // need to balancing
        enum Color {
            Red,
            Black,
        } color;
    } node;
    struct Allocate {
        enum Code next;
        long size;
    } allocate;
};


// Meta DataSegment
struct Context {
    enum Code next;
    int codeNum;
    __code (**code) (struct Context*);
    void* heapStart;
    void* heap;
    long heapLimit;
    int dataNum;
    stack_ptr code_stack;
    stack_ptr node_stack;
    union Data **data;
};