Re: __builtin_frame_address()

• Subject: Re: __builtin_frame_address()
• From: Jason Molenda <email@hidden>
• Date: Sat, 28 May 2005 17:56:56 -0700
• Delivered-to: email@hidden
• Delivered-to: email@hidden

On May 25, 2005, at 7:57 PM, Steve Checkoway wrote:

Is __builtin_frame_address() broken? I have some backtracing code that walks the stack essentially using:

Something like

bt ()
{
  void **fp = (void **) __builtin_frame_address (0);
  void *saved_pc = __builtin_return_address (0);
  void *saved_fp = __builtin_frame_address (1);
  int depth = 0;

  printf ("[%d] pc == %p fp == %p\n", depth++, saved_pc, saved_fp);
  fp = saved_fp;
  while (fp != NULL)
    {
      saved_fp = *fp;
      fp = saved_fp;
      if (*fp == NULL)
        break;
      saved_pc = *(fp + 2);
      printf ("[%d] pc == %p fp == %p\n", depth++, saved_pc, saved_fp);
    }
}

J
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