Doubt related to GCC Plugin 4.5

[A. Chahar]

Dear all,

I am doing some analysis of source code using GCC Plugin 4.5. I am 
registering my GIMPLE pass before "SSA" pass. To process each statement 
in each basic block, I am using statement iterator and FOR_EACH_BB 
macro. I am facing following problems:

1) At this pass, I am not able to recognize label and goto (except when 
programmer put them) statements using gimple_code(stmt). Therefore, it 
is hard to check which block is under which condition. Also, when I am 
trying to get (true and false condition) label from condition statement 
it is showing null. For example: tree truelabel = 
gimple_cond_true_label(stmt); Here, truelabel is null.

2)  In each BB I am trying to get loop info using loop_optimizer_init(). 
It gives the loop num value but it is NOT estimating number of 
iterations. I tried to using SCEV (the header file for the same is not 
available for Plugin, therefore I pasted it in plugin include folder), 
but still no success. For your perusal following is my code.
  scev_initialize();
  loop_optimizer_init(LOOPS_MAY_HAVE_MULTIPLE_LATCHES);
FOR_EACH_BB(bb) // Traverse each basic block
     {
         scev_initialize();
         loop=bb->loop_father;
         cout<<"BLOCK NO "<<bb->index<<"LOOP 
"<<loop->num<<"STATE"<<loop->estimate_state<<endl;

         gimple_stmt_iterator gsi;
         gsi = gsi_start_bb(bb);
         //iterate over all statements within basic block
         for (gsi; !gsi_end_p(gsi); gsi_next(&gsi)) {
                 processGimpleStatement(gsi_stmt(gsi), &gsi);

         }
     }
scev_finalize();
loop_optimizer_finalize()    ;

Can anyone help me in this regard?
Thanks,

Anupam