Calling of build phase?

UVM
, ,
18

In reply to dave_59:

Thank you so much for this example. I have few doubts about the code you shared with us.

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",0);
   endfunction
   function void build_phase(uvm_phase phase);
      `uvm_info("build", "phase",0);
   endfunction 
   function void connect_phase(uvm_phase phase);
      `uvm_info("connect", "phase",0);
   endfunction 
   task run_phase(uvm_phase phase);
      `uvm_info("run", "phase",0);
   endtask 
   function void report_phase(uvm_phase phase);
      `uvm_info("report", "phase",0);
   endfunction 
endclass 
class child extends uvm_component;
   grandchild gc1,gc2;
   function new(string name, uvm_component parent);
      super.new(name,parent);
      `uvm_info("new", "constructor",0);
   endfunction
   function void build_phase(uvm_phase phase);
      `uvm_info("build", "phase",0);
      gc1 = grandchild::type_id::create("gc1",this);
      `uvm_info("build", "created gc1",0);
      gc2 = grandchild::type_id::create("gc2",this);
      `uvm_info("build", "created gc2",0);
   endfunction
   function void connect_phase(uvm_phase phase);
      `uvm_info("connect", "phase",0);
   endfunction
   task run_phase(uvm_phase phase);
      `uvm_info("run", "phase",0);
   endtask 
   function void report_phase(uvm_phase phase);
      `uvm_info("report", "phase",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",0);
   endfunction
   function void build_phase(uvm_phase phase);
      `uvm_info("build", "phase",0);
      c1 = new("c1",this);
      c2 = new("c2",this);
   endfunction
   function void connect_phase(uvm_phase phase);
      `uvm_info("connect", "phase",0);
   endfunction
   task run_phase(uvm_phase phase);
      `uvm_info("run", "phase",0);
   endtask
   function void report_phase(uvm_phase phase);
      `uvm_info("report", "phase",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",0);
   endfunction
   env e;
   function void build_phase(uvm_phase phase);
      `uvm_info("build", "phase",0);
      e = new("e",this);
   endfunction
   function void report_phase(uvm_phase phase);
      uvm_component tmp=uvm_top.find("uvm_test_top.e");
      env e;
      $cast(e,uvm_top.find("uvm_test_top.e"));
      `uvm_info("report", "phase",0)
      e.print();
   endfunction // report_phase
endclass   
module top;
   env e2;
   initial begin
      e2 =new("e2",null);
      run_test("test");
   end
endmodule

  1. Inside the test class, env class creation of objects has been done differently. I mean
    we can use new, but should we not use the protocol; using
    { class_type::type_id::create(name of the object,this); }

  2. Inside the top module an object of env class has been created. I didn’t understand, why?

function void report_phase(uvm_phase phase);
      uvm_component tmp=uvm_top.find("uvm_test_top.e");
      env e;
      $cast(e,uvm_top.find("uvm_test_top.e"));
      `uvm_info("report", "phase",0)
      e.print();
   endfunction // report_phase

Here when we were finding whether any object named e has been created or not we used the
path uvm_top.find(“uvm_test_top.e”) . Why didn’t we use
uvm_test_top?find(“uvm_test_top.e”)? And also return type is uvm_component . Is the reason
as same as we know for the do_copy method having argument uvm_object i.e. implementation
of factory or something else?