use commands to trace breakpoint

最新推荐文章于 2019-06-18 18:58:11 发布

原创最新推荐文章于 2019-06-18 18:58:11 发布 · 493 阅读

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本文介绍如何使用GDB调试工具，在特定条件下设置断点并查看变量状态。通过实例演示了如何在函数`func`中当参数`a`大于10时暂停执行，并观察变量`c`的值。

gdb commands can be used to execute gdb commands after a breakpoint occurred.

Take this as example .

#include <stdio.h>

int func(int a, int b, int c) {
  return a + b - c;
}

int main(int argc, char *argv[]){
  int i = 0;

  for (; i < 100; i++){
    func(i, i++, 1);
  }
  return 0;
}

we want to break func when a > 10 and checkout variable c

(gdb) break func if a > 10
Breakpoint 1 at 0x80483f0: file test-me.c, line 4.
(gdb) commands
Type commands for breakpoint(s) 1, one per line.
End with a line saying just "end".
>print a
>end
(gdb) r
Starting program: /home/alloc/test/a.out

Breakpoint 1, func (a=11, b=10, c=1) at test-me.c:4
4      return a + b - c;
$1 = 11
(gdb) quit