代碼
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#include <iostream>
using namespace std;
int sum(int a,int b){
int temp=0;
temp= a +b;
return temp;
}
int main(){
int a =10;
int b=20;
int ret =sum(a,b);
return 0;
}
以上代碼考慮2個問題:
問題1:main函式呼叫sum,sum執行完成以后,怎么知道回到哪個函式中?
問題2:sum函式執行完后,回到main后,怎么知道從哪一行指令繼續執行的？
//------------------------------------------------------------------------------------------------------------------
//------------------------------------------------------------------------------------------------------------------
函式引數壓堆疊
//------------------------------------------------------------------------------------------------------------------
函式引數壓堆疊
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下一潭訓編指令地址入堆疊
//------------------------------------------------------------------------------------------------------------------
main函式堆疊底指標入堆疊
//------------------------------------------------------------------------------------------------------------------
移動ebp，進入被調函式
//------------------------------------------------------------------------------------------------------------------
為sum函式開辟函式堆疊幀
//------------------------------------------------------------------------------------------------------------------
將回傳值放入暫存器
//------------------------------------------------------------------------------------------------------------------
回退esp堆疊指標
//------------------------------------------------------------------------------------------------------------------
將ebp指回main函式堆疊底
//------------------------------------------------------------------------------------------------------------------
取出下一條執行的匯編指令地址并執行
//------------------------------------------------------------------------------------------------------------------
此時 esp ，ebp 又指向了main函式的堆疊底指標和堆疊頂指標
//------------------------------------------------------------------------------------------------------------------
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標籤：C++