Profiling & nested functions?

Profiling & nested functions?

[Laurent GUERBY]

Hi,

I searched the binutils mailing list and I find only an email from 2001 
by Daniel Jacobowitz on the subject without follow-ups:

http://sourceware.org/ml/binutils/2001-11/msg00408.html

And couldn't find "nested" keyword in bugzilla.

A GCC developper said that the appropriate calls were generated so this
was probably a gprof issue.

Should I open a bugzilla?

Thanks in advance for your help,

Laurent

-------- Forwarded Message --------
From: Laurent GUERBY <laurent@guerby.net>
To: gcc@gcc.gnu.org
Subject: Profiling & nested functions
Date: Mon, 14 Feb 2005 21:51:47 +0100
Hi,

Is GCC + gprof supposed to handle nested functions?
It looks like they are not properly reported.
The original problem was on Ada code with nested
functions. This is with HEAD and GNU gprof 2.15.91.0.2
on a SuSE 9.2 system.

Thanks in advance,

Laurent

$ cat cn.c
#define N 10000000
static int sum=0;
void p1(void) {
  int i;
  for(i=1;i<=N;i++) sum+=(i+1)/i;
}
void p2(void) {
  int f2(int x) {
    return x;
  }
  int i;
  for(i=1;i<=2*N;i++) sum+=f2(i+1)/i;
}
void p3(void) {
  int i;
  for(i=1;i<=3*N;i++) sum+=(i+1)/i;
}

int main(void) {
  p1();
  p2();
  p3();
  return 0;
}
$ gcc -pg -g cn.c 
$ ./a.out
$ gprof ./a.out 
[...]
Flat profile:
  %   cumulative   self              self     total           
 time   seconds   seconds    calls   s/call   s/call  name    
 49.49      8.70     8.70        1     8.70     8.70  p3
 34.13     14.70     6.00        1     6.00     6.00  p2
 16.38     17.58     2.88        1     2.88     2.88  p1
[...]
index % time    self  children    called     name
                                                 <spontaneous>
[1]    100.0    0.00   17.58                 main [1]
                8.70    0.00       1/1           p3 [2]
                6.00    0.00       1/1           p2 [3]
                2.88    0.00       1/1           p1 [4]
-----------------------------------------------
                8.70    0.00       1/1           main [1]
[2]     49.5    8.70    0.00       1         p3 [2]
-----------------------------------------------
                             20000000             p2 [3]
                6.00    0.00       1/1           main [1]
[3]     34.1    6.00    0.00       1+20000000 p2 [3]
                             20000000             p2 [3]
-----------------------------------------------
                2.88    0.00       1/1           main [1]
[4]     16.4    2.88    0.00       1         p1 [4]
-----------------------------------------------

Re: Profiling & nested functions?

[Daniel Jacobowitz]

On Tue, Feb 15, 2005 at 10:54:28PM +0100, Laurent GUERBY wrote:
> Hi,
> 
> I searched the binutils mailing list and I find only an email from 2001 
> by Daniel Jacobowitz on the subject without follow-ups:
> 
> http://sourceware.org/ml/binutils/2001-11/msg00408.html

That was a MIPS specific problem, so this isn't going to help you any.


-- 
Daniel Jacobowitz
CodeSourcery, LLC

Re: Profiling & nested functions?

[Nick Clifton]

Hi Laurent,

> A GCC developper said that the appropriate calls were generated so this
> was probably a gprof issue.
> 
> Should I open a bugzilla?

Yes please.  Including the test case would really help too.

Cheers
   Nick

Re: Profiling & nested functions?

[Laurent GUERBY]

Done:

http://sources.redhat.com/bugzilla/show_bug.cgi?id=747

Thanks for your time,

Laurent

On Wed, 2005-02-16 at 12:04 +0000, Nick Clifton wrote:
> Hi Laurent,
> 
> > A GCC developper said that the appropriate calls were generated so this
> > was probably a gprof issue.
> > 
> > Should I open a bugzilla?
> 
> Yes please.  Including the test case would really help too.
> 
> Cheers
>    Nick
>