Initializing an array of config db elements dynamically in top_configuration depending on a variable value passed from the test

UVM
, ,
1 


class base_config extends uvm_object;
  //
endclass
 
class top_config extends uvm_object;
  base_config b_cfg[];
  integer c_size;
   //In which phase can i do b_cfg =new(c_size);
   //for(int i=0; i < c_size; i++) begin
   //b_cfg[i]= base_config::type_id::create($sformatf("base_cfg_%0d",b_cfg));
   //end
 
endclass
 
class test extends base_test;
  top_config top_cfg;
   //if i want to pass c_size from the test like top_cfg.c_size = 4
   //in which part of the top_configuration class should i initialize the array. Array 
   //components are built and initialized in the build_phase if i'm not wrong but the c_size 
   //component cannot be initialized then. My best bet is to initialize this array before the 
   //simulation hits the run phase? how can i achieve this?
endclass
2

In reply to markiv:

Classes not derived from uvm_component do not have phases. You just need to construct objects before using them. You can do it as part of setting the size:

class top_config extends uvm_object;
  base_config b_cfg[];
  int c_size;
  function void set_c_size(int size);
   b_cfg= new[(c_size = size)];
   foreach (b_cfg[i]) b_cfg[i]= base_config::type_id::create($sformatf("base_cfg_%0d",b_cfg));
  endfunction
endclass

You can so this in your test in any base before the run_phase: build_, end_of_elaboration_, start_of_simulation_ phase.

3

In reply to dave_59:

Thanks for the response dave!

Okay, that is what i figured when i was looking at the uvm_object function definitions in uvm1.1.

Just wanted to clarify, to be able to construct the b_cfg i need to add the top_config class to my base test and call the set_c_size() function in any one of the phases before run_phase in my derived tests?

4

In reply to markiv:
Correct.

5

In reply to dave_59:

It works. Thank you