检查整数和字符数组的内存时字节顺序不一致

Inconsistent byte order while examining memory of an integer and a char array

little endian 机器上,我正在尝试使用 GDB 检查以下变量的内存。

int main()
{
      char buffer[4] = "1234";
      int value = 0x31323334;
          //ascii - "1 2 3 4"

      retun 0;
}

我希望看到的是:

对于缓冲区变量 - 0x34333231 对于值变量 - 0x34333231

但是,GDB 检查输出是:

(gdb) show endian
The target endianness is set automatically (currently little endian)

(gdb) x/w &value 
0x7fffffffe440: 0x31323334
(gdb) x/w buffer
0x7fffffffe444: 0x34333231

为什么在内存中存储int和char数组数据有区别? 看起来值变量存储为大端,我是否遗漏了什么?

变量buffer就是四个字节

+------+------+------+------+
| 0x31 | 0x32 | 0x33 | 0x34 |
+------+------+------+------+
^                           ^
|                           |
Low address                 High address

变量value就是四个字节

+------+------+------+------+
| 0x34 | 0x33 | 0x32 | 0x31 |
+------+------+------+------+
^                           ^
|                           |
Low address                 High address

并且 x 命令以本机字节顺序显示(在您的情况下为小端),导致您获得输出。