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What if inheritance occurs for a class with an embedded covergroup?

Jeff000

As the code shown below, what is the relationship between those two covergroup named cg?


  class A;
     int a;
     
     covergroup cg @(clk);
        option.per_instance = 1;
        v_a: coverpoint a
          iff(reset){}
        
     endgroup // cg
     
  endclass // A

   class B extends A;
     int b;
      
     covergroup cg @(clk);
        option.per_instance = 1;
        v_b: coverpoint b
          iff(reset){}
        
     endgroup // cg

   endclass // B
Parents

  • What behavior are you looking for? Almost any is possible and under your control.

    Do you "new" both groups when you create an instance of class B? Do you assign each covergroup a unique instance name? Are you looking at the instance-based report or the type-based report? 

    reg clk=0;
    always #5 clk = !clk;

    class A;
     int a;
     
     covergroup cg @(clk);
        option.per_instance = 1;
        v_a: coverpoint a
          iff(reset){}
     endgroup // cg

        function new;
          cg = new;
          cg.option.name = "A_group"; // optional
        endfunction
     
  endclass // A

   class B extends A;
     int b;
      
     covergroup cg @(clk);
        option.per_instance = 1;
        v_b: coverpoint b
          iff(reset){}
     endgroup // cg

     function new;
           super.new;  // optional
           cg = new;
           cg.option.name = "B_group"; // optional
          endfunction 
       endclass // B

      B b;
      initial
      begin
        b = new;
        b.a = 1;
        b.b = 2;
        #10 $finish;
      end

    Experiment with different combinations of these and see what results you get.

Reply

  • What behavior are you looking for? Almost any is possible and under your control.

    Do you "new" both groups when you create an instance of class B? Do you assign each covergroup a unique instance name? Are you looking at the instance-based report or the type-based report? 

    reg clk=0;
    always #5 clk = !clk;

    class A;
     int a;
     
     covergroup cg @(clk);
        option.per_instance = 1;
        v_a: coverpoint a
          iff(reset){}
     endgroup // cg

        function new;
          cg = new;
          cg.option.name = "A_group"; // optional
        endfunction
     
  endclass // A

   class B extends A;
     int b;
      
     covergroup cg @(clk);
        option.per_instance = 1;
        v_b: coverpoint b
          iff(reset){}
     endgroup // cg

     function new;
           super.new;  // optional
           cg = new;
           cg.option.name = "B_group"; // optional
          endfunction 
       endclass // B

      B b;
      initial
      begin
        b = new;
        b.a = 1;
        b.b = 2;
        #10 $finish;
      end

    Experiment with different combinations of these and see what results you get.

Children
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