如何从内部命令执行完成，然后执行另一个命令? [英] How to execute finish and then another command from inside commands?

问题描述

这是我的代码结构的简化示例:

This is a reduced example of the structure of my code:

void increment(int j);

int main()
{
  int i = 0;

  while(1) {
    i = increment(i);
  }

  return 0;
}

int increment(int j)
{
  return j + 1;
}

这里是对应的 GDB 脚本:

And here is the corresponding GDB script:

b increment
command 1
finish
print i
continue
end

问题在于 finish 命令会阻止其后的命令(即 print i 和 continue)不被调用.

The problem is that the finish command prevents the commands that come after it (namely print i and continue) to not be called.

有没有办法告诉 GDB 在任何 increment 调用之后立即打印 i?

Is there a way to tell GDB to print i right after any increment call?

推荐答案

您显然可以通过将所有命令包装在单个 python 调用中来解决此错误，例如

You can apparently work around this bug by wrapping all the commands in a single python invocation e.g.

(gdb) break doSomething
Breakpoint 1 at 0x400478: file iter.c, line 5.
(gdb) commands
Type commands for breakpoint(s) 1, one per line.
End with a line saying just "end".
>python gdb.execute("print i"); gdb.execute("finish"); gdb.execute("print i");
>end

Breakpoint 1, doSomething () at iter.c:5
5     while (i < 5)
$1 = 0
main (argc=1, argv=0x7fffffffe178) at iter.c:13
13    return 0;
$2 = 5

不需要 python 的第二个解决方法似乎是定义一个新的 gdb 命令并在命令中运行:

edit: a 2nd work around that doesn't require python appears to be defining a new gdb command and running that in commands:

define foo
print *i
set $addrOfI = i
finish
print *$addrOfI
end

break doSomething
commands
foo
end

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