Reverse Engineering for Beginners

CHAPTER 51. C++ CHAPTER 51. C++

};
};

class solid_object
{
public:
int density;
solid_object() { };
solid_object(int density)
{
this->density=density;
};
int get_density()
{
return density;
};
void dump()
{
printf ("this is solid_object. density=%d\n", density);
};
};

class solid_box: box, solid_object
{
public:
solid_box (int width, int height, int depth, int density)
{
this->width=width;
this->height=height;
this->depth=depth;
this->density=density;
};
void dump()
{
printf ("this is solid_box. width=%d, height=%d, depth=%d, density=%d\n", width,⤦
Çheight, depth, density);
};
int get_weight() { return get_volume() * get_density(); };
};

int main()
{
box b(10, 20, 30);
solid_object so(100);
solid_box sb(10, 20, 30, 3);

b.dump();

so.dump();

sb.dump();

printf ("%d\n", sb.get_weight());

return 0;
};

Let’s compile it in MSVC 2008 with the/Oxand/Ob0options and see the code ofbox::dump(),solid_object::dump()
andsolid_box::dump():

Listing 51.12: Optimizing MSVC 2008 /Ob0

?dump@box@@QAEXXZ PROC ; box::dump, COMDAT
; _this$ = ecx
mov eax, DWORD PTR [ecx+8]
mov edx, DWORD PTR [ecx+4]
push eax
mov eax, DWORD PTR [ecx]
push edx
push eax
; 'this is box. width=%d, height=%d, depth=%d', 0aH, 00H
push OFFSET ??_C@_0CM@DIKPHDFI@this?5is?5box?4?5width?$DN?$CFd?0?5height?$DN?$CFd@
call _printf
add esp, 16