# ** Fatal: (SIGSEGV) Bad handle or reference

UVM
1

bf is an item , create in factory
there is a dynamic array in bf which is called axcs
when I wanna access it
report # ** Fatal: (SIGSEGV) Bad handle or reference.



function  my_transfer  test(b_t data);
  my_transfer  bf[4];
  for(int i=0;i<4;i++) begin
    bf[i] = my_transfer::type_id::create($sformatf("bf[%0d]",i));
    bf[i].axcs = new[128];  //dynamic array
    for(int j=0;j<128;j++) begin
      bf[i].axcs[j].a_data = 30'b0;  //report  # ** Fatal: (SIGSEGV) Bad handle or reference.
    end
...
2

In reply to designer007:

What type is axcs?
Either bf[i] or bf[i].axcs is null. You need to check which one is null.

3

In reply to dave_59:


class my_transfer  extends uvm_sequence_item;

rand c0_t   axcs0[];
rand c1_t   axcs[];
...

//----------------------
class c1_t    extends uvm_sequence_item;

rand bit[29:0] a_data;
...
4

In reply to dave_59:
bf[i].axcs is item , should also be create,
Thanks @dave_59 @chr_sue


bf[i] = my_transfer::type_id::create($sformatf("bf[%0d]",i));
bf[i].axcs = new[128];  //dynamic array
5

In reply to designer007:

Please find a code example which reflects your problem:

package my_pkg;
   import uvm_pkg::*;
   `include "uvm_macros.svh"

class c1_t    extends uvm_sequence_item;
  `uvm_object_utils(c1_t)
 
rand bit[29:0] a_data;

function new(string name = "");
  super.new(name);
endfunction

endclass

class my_transfer  extends uvm_sequence_item;
  `uvm_object_utils(my_transfer)
 
rand c1_t   axcs[];
 
function new(string name = "");
  super.new(name);
  axcs = new[128];
endfunction

endclass

endpackage

module top;
   import uvm_pkg::*;
   `include "uvm_macros.svh"

   import my_pkg::*;

 initial begin
  my_transfer  bf[4];

  for(int i=0;i<4;i++) begin
    bf[i] = my_transfer::type_id::create($sformatf("bf[%0d]",i));
     for (int j = 0; j < 128; j++) begin
      bf[i].axcs[j] = c1_t::type_id::create($sformatf("axcs[%0d]", j)); 
      bf[i].axcs[j].a_data = j;  
    end  
  end
  for(int i=0;i<4;i++) begin
    for (int j = 0; j < 128; j++) begin
      `uvm_info("TOP", $sformatf("bf[%0d].axcs[%0d].a_data = %0d", i, j,  bf[i].axcs[j].a_data), UVM_MEDIUM)  
    end
  end  
 end 
endmodule