Sequence Data

Callgraph data is not enough
Example:
void a(void)
{
  int i;

  for (i = 0 ; i < 10 ; i ++)
    {
      b(); d();
    }
  /* lots of other stuff happens here */
  for (i = 0 ; i < 10 ; i ++)
    {
      c(); e();
    }
}