C++11新特性中的匿名函數Lambda表達式的彙編實作分析（一）

constructs a closure: an unnamed function object capable of capturing variables in scope. —— lambda functions (since c++11) [cppreference.com]

按照c++11标準的說法，lambda表達式的标準格式如下：

int main()

{

}

...省略...

push ebp

mov ebp,esp

sub esp,0cch

push ebx

push esi

push edi

push ecx

lea edi,[ebp-0cch]

mov ecx,33h

mov eax,0cccccccch

rep stos dword ptr es:[edi]

pop ecx

mov dword ptr [this],ecx

pop edi

pop esi

pop ebx

mov esp,ebp

pop ebp

ret

int 3

對應有彙編代碼：

auto lambda = []{

lea ecx,[ebp-5]

call 001e1570

sub esp,0d8h

lea edi,[ebp+ffffff28h]

mov ecx,36h

mov dword ptr [ebp-8],ecx

mov dword ptr [ebp-14h],0ah

mov eax,dword ptr [ebp-8]

mov ecx,dword ptr [eax]

mov dword ptr [ebp-14h],ecx

int a = 0xb;

mov dword ptr [ebp-8],0bh

lea eax,[ebp-8]

push eax

lea ecx,[ebp-14h]

call 010e1be0

call 010e1c20

lea edi,[ebp+ffffff34h]

mov ecx,dword ptr [ebp+8]

mov edx,dword ptr [ecx]

mov dword ptr [eax],edx

ret 4

fun(&a,this);

int fun(int in,int* this)