内存中的字符串文字在哪里?堆栈/堆? [英] Where in memory are string literals ? stack / heap?

问题描述

可能重复:
C 字符串文字:它们去哪儿了?

据我所知

一般来说，指针必须是由 malloc() 分配，并将被分配堆，然后由 free() 取消分配；

generally, pointer have to be allocated by malloc(), and will be allocated to heap, then unallocated by free();

和

非指针(int,char,float,etc..) 将是自动分配给堆栈，并且未分配，只要函数转到返回

non pointer(int,char,float,etc..) will be allocated automatically to stack, and unallocated as long as the function go to return

但是，从以下代码:

#include <stdio.h>

int main()
{
char *a;

a = "tesaja";

return 0;
}

a 将分配到哪里?堆栈还是堆?

where will a allocated to ? stack or heap ?

推荐答案

字符串 literal 将分配在数据段中.指向它的指针 a 将在堆栈上分配.

The string literal will be allocated in data segment. The pointer to it, a, will be allocated on the stack.

你的代码最终会被编译器转换成这样的:

Your code will eventually get transformed by the compiler into something like this:

#include <stdio.h>

const static char literal_constant_34562[7] = {'t', 'e', 's', 'a', 'j', 'a', ''};

int main()
{
    char *a;

    a = &literal_constant_34562[0];

    return 0;
}

因此，您的问题的确切答案是:都不是.Stack、data、bss 和 heap 都是不同的内存区域.const 静态初始化变量将在 data 中.

Therefore, the exact answer to your question is: neither. Stack, data, bss and heap are all different regions of memory. Const static initialized variables will be in data.

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