c - 如何在gdb中获取结构的基本数据类型

Question

在 gdb 中有什么方法可以获取结构的基本数据类型？

假设以下结构

typedef struct _trial
{
        int i;
        double j;
}trial_t;

在 gdb 中

(gdb) whatis trial_t
type = struct _trial
(gdb) whatis _trial
No symbol "_trial" in current context.
(gdb)

任何解决方法？

我知道这适用于简单的 typedef

typedef unsigned char BYTE; 
BYTE var;  
(gdb)whatis var 
type = BYTE 
(gdb)whatis BYTE 
BYTE = unsigned char 

Answer 1

你可能需要ptype

ptype accepts the same arguments as whatis, but prints a detailed description of the type, instead of just the name of the type.

(gdb) ptype struct _trial

甚至:

(gdb) ptype trial_t

Contrary to whatis, ptype always unrolls any typedefs in its argument declaration