如何让GDB断点在指定点数达到指定次数后才会中断？ [英] How to make a GDB breakpoint only break after the point is reached a given number times?

问题描述

我有一个被调用了很多次的函数，并最终发生了段错误。

然而，我不想在这个函数中设置断点，并且

我听说我可以设置一个计数器作为断点，并且每次命中断点时，计数器递减，并且只有在计数器 = 0时触发。

这是否准确？如果是，我该怎么做？请给gdb代码设置这样一个断点。 解决方案

阅读 GDB手册第5.1.6节。你需要做的是首先设置一个断点，然后为该断点号设置一个忽略计数，例如， ignore 23 1000 。

如果您不知道忽略断点的次数，想要手动计数，以下可能会有所帮助：

 忽略23 1000000＃set ignore count非常高。 
 
运行＃在达到忽略计数之前，程序将SIGSEGV。 
＃一旦SIGSEGV停止：
 
 info break 23＃告诉你断点有多少次被触发，
＃这正是你想要的数字
  

I have a function that is called some large number of times, and eventually segfaults.

However, I don't want to set a breakpoint at this function and stop after every time it's called, because I will be here for years.

I've heard that I can set a counter in GDB for a breakpoint, and each time the breakpoint is hit, the counter is decremented, and only gets triggered when the counter = 0.

Is this accurate, and if so how do I do it? Please give the gdb code for setting such a breakpoint.

解决方案

Read section 5.1.6 of the GDB manual. What you have to do is first set a breakpoint, then set an 'ignore count' for that breakpoint number, e.g. ignore 23 1000.

If you don't know how many times to ignore the breakpoint, and don't want to count manually, the following may help:

  ignore 23 1000000   # set ignore count very high.

  run                 # the program will SIGSEGV before reaching the ignore count.
                      # Once it stops with SIGSEGV:

  info break 23       # tells you how many times the breakpoint has been hit, 
                      # which is exactly the count you want

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