CHAPTER 51. C++ CHAPTER 51. C++
};
};
int main()
{
box b(1, 10, 20, 30);
sphere s(2, 40);
b.print_color();
s.print_color();b.dump();
s.dump();return 0;
};
Let’s investigate the generated code of thedump()functions/methods and alsoobject::print_color(), and see the
memory layout for the structures-objects (for 32-bit code).
So, here are thedump()methods for several classes, generated by MSVC 2008 with/Oxand/Ob0options^4
Listing 51.8: Optimizing MSVC 2008 /Ob0??_C@_09GCEDOLPA@color?$DN?$CFd?6?$AA@ DB 'color=%d', 0aH, 00H ; `string'
?print_color@object@@QAEXXZ PROC ; object::print_color, COMDAT
; _this$ = ecx
mov eax, DWORD PTR [ecx]
push eax
; 'color=%d', 0aH, 00H
push OFFSET ??_C@_09GCEDOLPA@color?$DN?$CFd?6?$AA@
call _printf
add esp, 8
ret 0
?print_color@object@@QAEXXZ ENDP ; object::print_color
Listing 51.9: Optimizing MSVC 2008 /Ob0?dump@box@@QAEXXZ PROC ; box::dump, COMDAT
; _this$ = 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 box. color=%d, width=%d, height=%d, depth=%d', 0aH, 00H ; `string'
push OFFSET ??_C@_0DG@NCNGAADL@this?5is?5box?4?5color?$DN?$CFd?0?5width?$DN?$CFd?0@
call _printf
add esp, 20
ret 0
?dump@box@@QAEXXZ ENDP ; box::dump
Listing 51.10: Optimizing MSVC 2008 /Ob0?dump@sphere@@QAEXXZ PROC ; sphere::dump, COMDAT
; _this$ = ecx
mov eax, DWORD PTR [ecx+4]
mov ecx, DWORD PTR [ecx]
push eax
push ecx
; 'this is sphere. color=%d, radius=%d', 0aH, 00H
push OFFSET ??_C@_0CF@EFEDJLDC@this?5is?5sphere?4?5color?$DN?$CFd?0?5radius@
call _printf
(^4) The/Ob0option stands for disabling inline expansion since function inlining can make our experiment harder