如果先前的命令失败，GDB命令将停止执行

Question

In GDB want to print values of all pointers in an array on hitting a breakpoint. There may be array elements with value as 0x0.

Ex:

arr[] = {0x0, 0x5cb04, 0x5510, 0x0, 0x5c84}

(gdb) info b
Num     Type           Disp Enb Address            What
1       breakpoint     keep y   0x1234 in fun1 at file1.c:200
        p arr
        p *arr[0]
        p *arr[1]
        p *arr[2]
        p *arr[3]
        c

But GDB fails to print values of *arr[1], *arr[2], *arr[3], coz

*arr[0] hits the error

"Cannot access memory at address 0x0" .

Is there any solution or workaround to this problem?

Answer 1

gdb print命令可以使用任何有效的表达式 ，因此您可以执行以下操作：

p (arr[0]) ? *arr[0] : "null"