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phase jump to function phases


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Hi.

  in UVM, It is legal to have phase jump to any function phases.  but it seems in below demonstration code it does not work as I expected.  I expected the flag build_agt2 = 1 after the phase.jump(build_phase).

 

    class mycomponent extends uvm_component;

      .......

     bit build_agt2;

     function void build_phase(uvm_phase phase); 

           `create_agt1();

           if ( build_agt2)  

              `create_ag2() ; or

              // `override_agt1_by_agt2();  

     endfunction

 

    task run_phase;     

             // change flag build_agt2 to 1;

   endtask

 

   function void phase_ready_to_end;

          // if the imp phase  is in shutdown_phase

          // then phase.jump to build_phase

 endfunction

 

 

  

          

        

           

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Thank you Bhunter1972 for response.  I have created a stright forward testcase. By running it, you will see the build_phase does get called 4 times. I might miss something.

  

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

class test extends uvm_test;
   int count;
  `uvm_component_utils(test)
  function new ( string name ="test", uvm_component p = null);
    super.new(name, p);
  endfunction
  virtual function void build_phase(uvm_phase phase);
    `uvm_info(get_full_name(), "i am in build_phase", UVM_MEDIUM)
  endfunction
  virtual function void connect_phase(uvm_phase phase);
    `uvm_info(get_full_name(), "I am in connect_phase", UVM_MEDIUM)
  endfunction
  virtual task pre_reset_phase(uvm_phase phase);
    `uvm_info(get_full_name(), "i am in test pre_reset_phase", UVM_MEDIUM)
  endtask
  virtual task main_phase ( uvm_phase phase);
    phase.raise_objection(this);
    `uvm_info(get_full_name(), " i am in test main_phase ", UVM_MEDIUM)
    phase.drop_objection(this);
  endtask
  function void phase_ready_to_end(uvm_phase phase);
    super.phase_ready_to_end(phase);
    if ( phase.get_imp() == uvm_shutdown_phase::get() && count < 3) begin
      phase.jump(uvm_build_phase::get());
      count++;
    end
  endfunction
endclass

 

module test;
  initial begin
   run_test("test");
  end
endmodule

 

thanks

andrwe

 

 

 

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Based on what the developers have told me, phase jumping to a pre-run phase might "kinda-sorta work so don't do it."

 

Put more simply, phase jumping was not intended to go back to a pre-run phase, so even though the functions may get called again this will lead to issues.

 

Probably they should have more clearly made it NOT work, but whatever.

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