gdb中如何显示一个结构体中成员的偏移？

todaygood

分析内核core 可以使用crash工具，它可以打印结构体中成员的偏移； 而在用gdb分析用户态程序的core时，没有发现该功能，请问gdb中有这功能吗？

crash> struct -o task_struct
struct task_struct {
     [0] volatile long int state;
     [8] void *stack;
    [16] atomic_t usage;
    [20] unsigned int flags;
    [24] unsigned int ptrace;
    [28] int lock_depth;
    [32] int prio;
    [36] int static_prio;
    [40] int normal_prio;
    [44] unsigned int rt_priority;

        (gdb) ptype struct malloc_chunk
type = struct malloc_chunk {
    size_t prev_size;
    size_t size;
    struct malloc_chunk *fd;
    struct malloc_chunk *bk;
    struct malloc_chunk *fd_nextsize;
    struct malloc_chunk *bk_nextsize;
}

xs3c

回复 1# todaygood
(gdb) p &((struct task_struct *)0)->prio
$1 = (int *) 0x30
(gdb) p &((struct task_struct *)0)->state
$2 = (volatile long int *) 0x0
(gdb)


   

瀚海书香

回复 2# xs3c

(gdb) p &((struct task_struct *)0)->prio
$1 = (int *) 0x30
(gdb) p &((struct task_struct *)0)->state
$2 = (volatile long int *) 0x0
(gdb

Great, just like container_of!

   

todaygood

回复 2# xs3c


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