easy_vm.cpp

enum
{
    NOP,
    ADD
};


struct thestack {
	union {
		int i;
	} data;
	int type;
};
enum
{
    TYPE_INT
};
void xuy(thestack* args, short* code, int code_size)
{
    auto* const stack = static_cast<thestack*>(calloc(64, sizeof(thestack)));
    register auto* sp = stack;
    register auto* ip = code;

    auto* end = ip + code_size;

    while (1)
    {
        if(*ip == *end)
            printf("the fucking end");
        switch(*ip)
        {
            case NOP:
                printf("nop");
                ++ip;
                break;
            case ADD:
                ip++;
                sp--;
                if (sp->type == TYPE_INT)
                {
                    sp[-1].data.i += sp[0].data.i;
                }
                break;
        }
    }
}
void call()
{
    short code[] = {
        0x0,
        0x1
    };
    auto* const args = new thestack[2];
    args[0].type = TYPE_INT;
    args[0].data.i = 15;
    
    args[1].type = TYPE_INT;
    args[1].data.i = 10;
    xuy(args, code, 2);
}