C function calls, about the execution of function calls in C

result love(boy, girl)if( boy.There is a room () and boyThere is a car ();

return girl.marry (boy);

if( girl.Willing to wait ().

while(!(boy.Make > 100,000 and girlAffection > 8).

for( day=1; day <=365;day++)if( day == Valentine's Day )

if( rose )).

girl.Affection++;

elsegirl.Affection++;

if( day == girl.Birthday).

if( rose )).

girl.Affection++;

elsegirl.Affection++;

boy.Desperate to make money ();

if( boy.There is a room () and boyThere is a car ();

return girl.marry (boy);

Age++; girl.Affection++;

return another_boy);

There are six steps to the execution of a function call in C++:

1. Parameter transfer: Stack the function parameters: mov eax, dword ptr [n]; n is the parameter variable).

2. Operation: Press the frame pointer into the stack: push ebp; Make the frame pointer equal to the stack pointer:

mov ebp,esp；To self-subtract the stack pointer, the resulting memory address should be (sufficient) to store the local state of the called function: sub esp, 0cch.

3. Pass in the save state: push ebx; Save the value of the EBX register; push esi ;Holds the value of the ESI register; push edi ;Holds the value of the EDI register.

4. Load EDI: LEA EDI, [EBP-0CCH]; 0cch is the size of the currently active record.

5. Restore the incoming save state: 00411417 pop edi; 00411418 pop esi；The POP EBX stack pointer is moved up to restore the space; add esp,0cch。

6. The function returns to free space: make the stack pointer equal to the frame pointer: mov esp, ebp; Eject the old frame pointer from the stack: pop ebp; Return: ret.