Virtual functions call asm

This could be a loop over 37 objects with virtual functions, the simplified version could look similar to this (written in C++)

#include <iostream>

class Animal
{
public:
    virtual void makeSound() = 0;
    virtual char* getColor() = 0;
    virtual ~Animal() = 0;
};

class Cat : public Animal
{
public:
    Cat();
    void makeSound() { std::cout << "meow" << std::endl; }
    char* getColor() { return "red"; };
    ~Cat() {};
};

Animal* animals[] = {new Cat(), new Cat(), new Cat()};
int main()
{
    for (int i = 0; i < 3; i++)
        if (animals[i])
            std::cout << animals[i]->getColor();

    for (int i = 0; i < 3; i++)
        delete animals[i];
    return 0;
}

With the core lines:

if (animals[i])
  std::cout << animals[i]->getColor();

Compiled to this by clang 8.0.0:

cmp     dword ptr [animals + eax*4], 0
je      .LBB2_4
mov     eax, dword ptr [ebp - 8]
mov     eax, dword ptr [animals + eax*4]
mov     ecx, dword ptr [eax]
mov     dword ptr [esp], eax
call    dword ptr [ecx + 4]

Additionally your code seems to follow Microsoft __thiscall calling convention, as the this pointer is stored in ecx register.