[Bug binutils/747] New: Profiling of nested functions

[laurent at guerby dot net]

It looks like nested functions are not properly reported by gprof.
The original problem was on Ada code with nested
functions. This is with GCC from CVS HEAD 20050213 and GNU gprof 2.15.91.0.2
on a x86 SuSE 9.2 system. A GCC developper suggested that the appropriate calls
seemed to be generated properly, so the problem was likely in gprof.

$ 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]
-----------------------------------------------

-- 
           Summary: Profiling of nested functions
           Product: binutils
           Version: 2.15
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
        AssignedTo: unassigned at sources dot redhat dot com
        ReportedBy: laurent at guerby dot net
                CC: bug-binutils at gnu dot org


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

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