有什么办法在gdb中设置一个断点，它是调用堆栈的条件吗？ [英] Is there any way to set a breakpoint in gdb that is conditional on the call stack?

问题描述

我在Linux上的gdb 7.1中调试C ++。

I am debugging C++ in gdb 7.1 on Linux.

我有一个函数 a（）在许多地方的代码中调用。我想在其中设置断点，但只有当它从 b（）调用。有什么办法吗？

I have a function a() that is called in many places in the code. I want to set a breakpoint in it, but only if it was called from b(). Is there any way to do it?

只有当 b（） c（），以此类推。

推荐答案

需要你描述很经常出现，通常在 some_utility_fn 的上下文中被调用很多，但是你只对来自 some_other_fn的调用感兴趣

The need you describe comes up quite often, usually in the context of some_utility_fn being called a lot, but you only are interested in the call which comes from some_other_fn.

您可以使用CVS中继的GDB中新的嵌入式Python支持来脚本化整个交互。

You could probably script this entire interaction using the new embedded Python support in GDB from CVS trunk.

没有Python，你可以做什么，但通常的方法是在 a（）禁用断点$ c>，并通过 b（）上的断点附加的命令启用它。

Without Python, you are limited in what you can do, but the usual technique is to have a disabled breakpoint on a(), and enable it from a command, attached to a breakpoint on b().

例如：

int a(int x)
{
  return x + 1;
}

int b()
{
  return a(1);
}

int call_a_lots()
{
  int i, sum = 0;
  for (i = 0; i < 100; i++)
    sum += a(i);
}

int main()
{
  call_a_lots();
  return b();
}

gcc -g t.c
gdb -q ./a.out
Reading symbols from /tmp/a.out...done.
(gdb) break a
Breakpoint 1 at 0x4004cb: file t.c, line 3.
(gdb) disable 1
(gdb) break b
Breakpoint 2 at 0x4004d7: file t.c, line 8.
(gdb) command 2
>silent
>enable 1
>continue
>end
(gdb) run

Breakpoint 1, a (x=1) at t.c:3
3     return x + 1;
(gdb) bt
#0  a (x=1) at t.c:3
#1  0x00000000004004e1 in b () at t.c:8
#2  0x000000000040052c in main () at t.c:21
(gdb) q

Voila： c $ c> a（）从 b（）调用，忽略先前对$ c $ c>。

Voila: we've stopped on a() called from b(), ignoring previous 100 calls to a().

这篇关于有什么办法在gdb中设置一个断点，它是调用堆栈的条件吗？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！