《coredump问题原理探究》Linux x86版5.6节C风格数据结构内存布局之复合类型构成的结构体

 #include <stdio.h>
 struct xuzhina_dump_c05_s3_2_sub
 {   
     char a;
     short b;
 };
 
 struct xuzhina_dump_c05_s3_2
 {   
     int c;
     long d;
     struct xuzhina_dump_c05_s3_2_sub sub;
 };
 
 
 int main()
 {   
     struct xuzhina_dump_c05_s3_2 test;
     
     scanf( "%c, %hd, %d, %ld", &test.sub.a, &test.sub.b,
             &test.c, &test.d );
     
     return test.c + test.d;
 }

(gdb) disassemble main
Dump of assembler code for function main:
   0x08048570 <+0>:     push   %ebp
   0x08048571 <+1>:     mov    %esp,%ebp
   0x08048573 <+3>:     and    $0xfffffff0,%esp
   0x08048576 <+6>:     sub    $0x30,%esp
   0x08048579 <+9>:     lea    0x24(%esp),%eax
   0x0804857d <+13>:    add    $0x4,%eax
   0x08048580 <+16>:    mov    %eax,0x10(%esp)
   0x08048584 <+20>:    lea    0x24(%esp),%eax
   0x08048588 <+24>:    mov    %eax,0xc(%esp)

   0x0804858c <+28>:    lea    0x24(%esp),%eax
   0x08048590 <+32>:    add    $0xa,%eax
   0x08048593 <+35>:    mov    %eax,0x8(%esp)

   0x08048597 <+39>:    lea    0x24(%esp),%eax
   0x0804859b <+43>:    add    $0x8,%eax
   0x0804859e <+46>:    mov    %eax,0x4(%esp)

   0x080485a2 <+50>:    movl   $0x8048664,(%esp)
   0x080485a9 <+57>:    call   0x8048440 <scanf@plt>
   0x080485ae <+62>:    mov    0x24(%esp),%edx
   0x080485b2 <+66>:    mov    0x28(%esp),%eax
   0x080485b6 <+70>:    add    %edx,%eax
   0x080485b8 <+72>:    jmp    0x80485c2 <main+82>
   0x080485ba <+74>:    mov    %eax,(%esp)
   0x080485bd <+77>:    call   0x8048460 <_Unwind_Resume@plt>
   0x080485c2 <+82>:    leave  
   0x080485c3 <+83>:    ret    
End of assembler dump.

   0x08048597 <+39>:    lea    0x24(%esp),%eax
   0x0804859b <+43>:    add    $0x8,%eax
   0x0804859e <+46>:    mov    %eax,0x4(%esp)

   0x0804858c <+28>:    lea    0x24(%esp),%eax
   0x08048590 <+32>:    add    $0xa,%eax
   0x08048593 <+35>:    mov    %eax,0x8(%esp)