打印变量的类型和所在文件
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小牛编辑
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2023-12-01
#include <stdio.h>
struct child {
char name[10];
enum { boy, girl } gender;
};
struct child he = { "Tom", boy };
int main (void)
{
static struct child she = { "Jerry", girl };
printf ("Hello %s %s.\n", he.gender == boy ? "boy" : "girl", he.name);
printf ("Hello %s %s.\n", she.gender == boy ? "boy" : "girl", she.name);
return 0;
}
技巧
在gdb中,可以使用如下命令查看变量的类型:
(gdb) whatis he
type = struct child
如果想查看详细的类型信息:
(gdb) ptype he
type = struct child {
char name[10];
enum {boy, girl} gender;
}
如果想查看定义该变量的文件:
(gdb) i variables he
All variables matching regular expression "he":
File variable.c:
struct child he;
Non-debugging symbols:
0x0000000000402030 she
0x00007ffff7dd3380 __check_rhosts_file
哦,gdb会显示所有包含(匹配)该表达式的变量。如果只想查看完全匹配给定名字的变量:
(gdb) i variables ^he$
All variables matching regular expression "^he$":
File variable.c:
struct child he;
注:info variables
不会显示局部变量,即使是static的也没有太多的信息。
详情参见 gdb手册