C++ foroperator

How does C++ for operator truly look like

He doesn’t know this

She doesn’t know this either

... he doesn’t even care

He definitely does!

do you

MicrosoftVisual C++

x86 Assembler

&

let’s take

and have a look …

_main proc nearpush esixor esi, esi

loc_401003:push esipush offset “%x"call _printfadd esp, 8inc esicmp esi, 0FFhjl short loc_401003xor eax, eaxpop esiretn

_main endp

void _tmain(int argc, _TCHAR* argv[]){

for (int i = 0; i < 255; ++i){

printf(“%x", i);}

}

_main proc nearpush esixor esi, esi

loc_401003:push esipush offset “%x"call _printfadd esp, 8inc esicmp esi, 0FFhjl short loc_401003xor eax, eaxpop esiretn

_main endp

void _tmain(int argc, _TCHAR* argv[]){

for (int i = 0; i < 255; ++i){

printf(“%x", i);}

}

_main proc nearpush esixor esi, esi

loc_401003:push esipush offset “%x"call _printfadd esp, 8inc esicmp esi, 0FFhjl short loc_401003xor eax, eaxpop esiretn

_main endp

void _tmain(int argc, _TCHAR* argv[]){

for (int i = 0; i < 255; ++i){

printf(“%x", i);}

}

_main proc nearpush esixor esi, esi

loc_401003:push esipush offset “%x"call _printfadd esp, 8inc esicmp esi, 0FFhjl short loc_401003xor eax, eaxpop esiretn

_main endp

void _tmain(int argc, _TCHAR* argv[]){

for (int i = 0; i < 255; ++i){

printf(“%x", i);}

}

_main proc nearpush esixor esi, esi

loc_401003:push esipush offset “%x"call _printfadd esp, 8inc esicmp esi, 0FFhjl short loc_401003xor eax, eaxpop esiretn

_main endp

void _tmain(int argc, _TCHAR* argv[]){

for (int i = 0; i < 255; ++i){

printf(“%x", i);}

}

_main proc nearpush esixor esi, esi

loc_401003:push esipush offset “%x"call _printfadd esp, 8inc esicmp esi, 0FFhjl short loc_401003xor eax, eaxpop esiretn

_main endp

void _tmain(int argc, _TCHAR* argv[]){

for (int i = 0; i < 255; ++i){

printf(“%x", i);}

}

How it could have beenrecognized in assembly

Quite simple. Just ...

Counter changing

by the presence of the instructions of…

Counter comparison

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Counter changing

Counter comparison

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by the presence of the instructions of…

_main proc nearpush esixor esi, esi

loc_401003:push esipush offset “%x"call _printfadd esp, 8inc esicmp esi, 0FFhjl short loc_401003xor eax, eaxpop esiretn

_main endp

_main proc nearpush esixor esi, esi

loc_401003:push esipush offset “%x"call _printfadd esp, 8inc esicmp esi, 0FFhjl short loc_401003xor eax, eaxpop esiretn

_main endp

Counter changing

Counter comparison

Jumps

by the presence of the instructions of…

Counter changing

Counter comparison

Jumps

by the presence of the instructions of…

_main proc nearpush esixor esi, esi

loc_401003:push esipush offset “%x"call _printfadd esp, 8inc esicmp esi, 0FFhjl short loc_401003xor eax, eaxpop esiretn

_main endp

_main proc nearpush esixor esi, esi

loc_401003:push esipush offset “%x"call _printfadd esp, 8inc esicmp esi, 0FFhjl short loc_401003xor eax, eaxpop esiretn

_main endp

Counter changing

Counter comparison

Jumps

by the presence of the instructions of…

Counter changing

Counter comparison

Jumps

by the presence of the instructions of…

_main proc nearpush esixor esi, esi

loc_401003:push esipush offset “%x"call _printfadd esp, 8inc esicmp esi, 0FFhjl short loc_401003xor eax, eaxpop esiretn

_main endp

_main proc nearpush esixor esi, esi

loc_401003:push esipush offset “%x"call _printfadd esp, 8inc esicmp esi, 0FFhjl short loc_401003xor eax, eaxpop esiretn

_main endp

Counter changing

Counter comparison

Jumps

by the presence of the instructions of…

And once again …

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for contains instructions of …

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for contains instructions of …

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for contains instructions of …

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for contains instructions of …