显示结构体字段在运行时堆栈中存储顺序的代码

Question

这是一次采访中提出的问题之一。不知道发贴好还是不发好。但答案会对我有帮助。

我们知道局部变量将存储在堆栈中，假设我们有这样的代码。

int main()
{
    struct ST1 {
        char ch1;
        short s;
        char ch2;
        long long ll;
        int i;
    }s1;
    function(s1);// pasing structure to function
// some code
}

function(struct ST1 s1) {
    // code to show the order in which the fields of the structure are stored on the run time stack
}

如何在函数中编写代码来显示结构体字段在运行时堆栈中的存储顺序？

Answer 1

How can it be possible to write a code in function to show the order in which the fields of the structure are stored?

我们不需要； C语言标准保证顺序:

[C99 §6.7.2.1] Within a structure object, the non-bit-field members and the units in which bit-fields reside have addresses that increase in the order in which they are declared.