Assembly Language for Beginners

3.18. C++

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 3.92: 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
ret 0
?dump@box@@QAEXXZ ENDP ; box::dump

Listing 3.93: Optimizing MSVC 2008 /Ob0

?dump@solid_object@@QAEXXZ PROC ; solid_object::dump, COMDAT
; _this$ = ecx
mov eax, DWORD PTR [ecx]
push eax
; 'this is solid_object. density=%d', 0aH
push OFFSET ??_C@_0CC@KICFJINL@this?5is?5solid_object?4?5density?$DN?$CFd@
call _printf
add esp, 8
ret 0
?dump@solid_object@@QAEXXZ ENDP ; solid_object::dump

Listing 3.94: Optimizing MSVC 2008 /Ob0

?dump@solid_box@@QAEXXZ PROC ; solid_box::dump, COMDAT
; _this$ = ecx
mov eax, DWORD PTR [ecx+12]
mov edx, DWORD PTR [ecx+8]
push eax
mov eax, DWORD PTR [ecx+4]
mov ecx, DWORD PTR [ecx]
push edx
push eax
push ecx
; 'this is solid_box. width=%d, height=%d, depth=%d, density=%d', 0aH