Brain fart alert

* Brain fart alert
@ 2012-07-21 18:22 Nicolas
       [not found] ` <CACHCVZ6oDyFwGbC4EwF_wsR9tCkoych5N6buLhRRLcyaL6iifw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
  0 siblings, 1 reply; 20+ messages in thread
From: Nicolas @ 2012-07-21 18:22 UTC (permalink / raw)
  To: dwarves-u79uwXL29TY76Z2rM5mHXA

[-- Attachment #1: Type: text/plain, Size: 687 bytes --]

Hello,

I tried using pahole, but I get a brain fart alert with the file
attached (which is an extract from stdio.h). I'm running dwarves 1.10,
libdw1 0.152 and g++ 4.6.1, on i386.

Here is what I get:

$ g++ -Wall -g -c brainfart.cpp -o brainfart.o && pahole brainfart.o
class ios_base {
	enum _Ios_Openmodeconst    in;                   /*     0     4 */
	typedef enum _Ios_Fmtflags fmtflags;

	/* size: 1, cachelines: 1, members: 1 */
	/* padding: 65533 */
	/* last cacheline: 1 bytes */

	/* BRAIN FART ALERT! 1 != 4 + 0(holes), diff = -3 */

};

Moreover, on amd64, pahole segfaults if I do the same (with dwarves
1.10, libdw1 0.152, g++ 4.6.3).

Any ideas?

Thanks a lot,
Nicolas

[-- Attachment #2: brainfart.cpp --]
[-- Type: text/x-c++src, Size: 289 bytes --]

namespace std
{
  enum _Ios_Fmtflags
    {
      a = 1,
    };
  enum _Ios_Openmode
    {
      _S_in = 1L << 3,
    };
  class ios_base
  {
  public:
    typedef _Ios_Fmtflags fmtflags;
    static const _Ios_Openmode in = _S_in;
  };
  void setiosflags(ios_base::fmtflags __mask)  {  }
}

^ permalink raw reply	[flat|nested] 20+ messages in thread