The process of virtual table ptr initialization of C++

[jemmy512]

I want divive deeper into vitual table ptr initialization of C++ OOP and want to know how a virtual table ptr of a class object initialized.

This is the class inheritance heirarchy.

struct Base {
   virtual ~Base() = default;

   virtual void FnBase() {  }

   int a;
   int b;
};

struct BaseA : virtual public Base {
   virtual void FnBaseA() {  }

   int a;
   int b;
};

struct BaseB : virtual public Base {
   virtual void FnBaseB() {  }

   int a;
   int b;
};

struct Derive : public BaseB, public BaseA {
   void FnBase() override {  }
   void FnBaseA() override {  }
   void FnBaseB() override {  }
};

int main() {
   Derive d;
   return 0;
}

[jemmy512]

Found great blogs about virtual tables initialization

• What does C++ Object Layout Look Like?
• C++ Virtual Table Tables(VTT)
• Understand C++ vtable from assembly code 🔗 Part 1

And my lab: https://github.com/Jemmy512/software-engineer/blob/master/Cpp/README.md