Override by instance

UVM
,
1

Hi,
I am new to UVM and was trying the set_inst_override_by_type method. the first grandchild object is created using the factory create method, so, I it should be supporting these two overrides as far as I know. When I’m using “set_type_override_by_type” then the code is working as it should and printing “I’m the new grandchild” when e.c1.gc1.display() is called in the report_phase of test class. But when I use set_inst_override_by_type to just override e.c1.gc1, the override is not happening and display function of the grandchild is being called instead of the overriding display function of the newgrandchild class. The same can be seen in the topology that I’m printing in the same reporting phase. I’ve attached my full code which I was trying on EDA playground. Please help me out with this.


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

class grandchild extends uvm_component;
`uvm_component_utils(grandchild)   
   function new(string name, uvm_component parent);
      super.new(name,parent);
     `uvm_info("new", "constructor_gc",0)
   endfunction
   function void build_phase(uvm_phase phase);
      `uvm_info("build", "phase_gc",0)
   endfunction 
   function void connect_phase(uvm_phase phase);
      `uvm_info("connect", "phase_gc",0)
   endfunction 
   task run_phase(uvm_phase phase);
     `uvm_info("run", "phase_gc",0)
   endtask 
   function void report_phase(uvm_phase phase);
      `uvm_info("report", "phase_gc",0)
   endfunction 
  virtual function void display();
    `uvm_info("DISP","I'm grandchild",0);
  endfunction
endclass 

class newgrandchild extends grandchild;
  `uvm_component_utils(newgrandchild)
  function new(string name, uvm_component parent);
      super.new(name,parent);
    `uvm_info("new", "constructor_ngc",0)
   endfunction
  function void build_phase(uvm_phase phase);
    `uvm_info("build", "phase_ngc",0)
   endfunction
  function void connect_phase(uvm_phase phase);
    `uvm_info("connect", "phase_ngc",0)
   endfunction 
   task run_phase(uvm_phase phase);
     `uvm_info("run", "phase_ngc",0)
   endtask 
   function void report_phase(uvm_phase phase);
     `uvm_info("report", "phase_ngc",0)
   endfunction 
  virtual function void display();
    `uvm_info("DISP","I'm the new grandchild",0);
  endfunction
endclass


class child extends uvm_component;
  `uvm_component_utils(child)
   grandchild gc1,gc2;
   
   function new(string name, uvm_component parent);
      super.new(name,parent);
     `uvm_info("new", "constructor_c",0)
   endfunction
   function void build_phase(uvm_phase phase);
      `uvm_info("build", "phase_c",0)
      gc1 = grandchild::type_id::create("gc1",this);
     `uvm_info("build", "created gc1",0)
     gc2 = new("gc2",this);
     `uvm_info("build", "created gc2",0)
   endfunction
   function void connect_phase(uvm_phase phase);
      `uvm_info("connect", "phase_c",0)
   endfunction
   task run_phase(uvm_phase phase);
      `uvm_info("run", "phase_c",0)
   endtask 
   function void report_phase(uvm_phase phase);
      `uvm_info("report", "phase_c",0)
   endfunction 
endclass
class env extends uvm_env;
   `uvm_component_utils(env)
   child c1,c2;
   
   function new(string name, uvm_component parent);
      super.new(name,parent);
     `uvm_info("new", "constructor_e",0)
   endfunction
   function void build_phase(uvm_phase phase);
      `uvm_info("build", "phase_e",0);
     set_type_override_by_type(grandchild::get_type(),newgrandchild::get_type()); // --> All instances getting overridden. Working fine.
     //set_inst_override_by_type("*.e.c1.gc1",grandchild::get_type(),newgrandchild::get_type()); // --> No instance getting overridden. Not working.
     
     c1 = child::type_id::create("c1",this);
     c2 = new("c2",this);
   endfunction
   function void connect_phase(uvm_phase phase);
      `uvm_info("connect", "phase_e",0)
   endfunction
   task run_phase(uvm_phase phase);
      `uvm_info("run", "phase_e",0)
   endtask
   function void report_phase(uvm_phase phase);
      `uvm_info("report", "phase_e",0)
   endfunction 
endclass : env

class test extends uvm_test;
   `uvm_component_utils(test);
   function new(string name, uvm_component parent);
      super.new(name,parent);
     `uvm_info("new", "constructor_t",0)
   endfunction
   env e;
   function void build_phase(uvm_phase phase);
      `uvm_info("build", "phase_t",0)
      e = new("e",this);
   endfunction
   function void report_phase(uvm_phase phase);
      `uvm_info("report", "phase_t",0)
      uvm_top.print();     
    e.c1.gc1.display();
   endfunction // report_phase
endclass   

module top;
   env e2,e3;
   
   initial begin
      e2 = env::type_id::create("e2",null);
     e3 = new("e3",e2);
      run_test("test");
   end
endmodule
2

[i]In reply to kavish.ahmad1:[

Prototype for function
set_inst_override_by_type is :

functiont_inst_override_by_type ( uvm_object_wrapper original_type,
uvm_object_wrapper override_type,
string full_inst_path )

3

In reply to kavish.ahmad1:

When set_inst_override_by_type() doesn’t work, it’s most likely due to the hierarchical path being incorrect. The path is relative to the hierarchy of the call, so it should be “c1.gc1”.

4

Thanks both.
I finally got it.
If I want to use the factory function then I’ll first have to get the instance of the factory and then use the function mentioned by Shipra_s and give the full hierarchical name to the component as shown below -


uvm_factory factory = factory.get();
factory.set_inst_override_by_type(grandchild::get_type(),newgrandchild::get_type(),{get_full_name(),".e.c1.gc1"});

Or if I want to use the convenience function then I’ll have to give the relative hierarchical path to the component I want to override.
@Shipra_s, the prototype for the convenience function that I’m using is -


function void set_inst_override_by_type(	string 	relative_inst_path,
uvm_object_wrapper 	original_type,
uvm_object_wrapper 	override_type	)