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  • difference between creating a object in function new constructor and a task.

difference between creating a object in function new constructor and a task.

SystemVerilog 6304
Default Class Construcor 1 function new 4 #systemverilog 594
rakesh2learn
rakesh2learn
Full Access
30 posts
November 23, 2017 at 10:20 pm

In example 1 and example 2, does creating object 'gen_h' and 'drv_h' have any difference? Is there any drawback in creating objects in a task rather than in function 'new' constructor? Thank you.

EXAMPLE 1:

class env;

  generator gen_h; // here generator is a different class
  driver drv_h; // here driver is a different class

function new();
   gen_h = new();
   drv_h = new();
endfunction

task run();
  fork
   gen_h.run();
   drv_h.run();
  join
endtask

endclass

EXAMPLE 2:
class env;

  generator gen_h; // generator is a different class
  driver drv_h; // driver is a different class

task run();
  gen_h = new();
  drv_h = new(); 
  fork
   gen_h.run();
   drv_h.run();
  join
endtask

endclass

Replies

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dave_59
dave_59
Forum Moderator
10650 posts
November 24, 2017 at 12:06 am

In reply to rakesh2learn:

Your question really should be: "what code should we put in the constructor versus any other class method?"

There are at least two independent issues. One is when you extend a class, you cannot override the constructor, you can only append to it. So you can't prevent the driver from being constructed. You should put the bare minimum amount of code in a class constructor.
The other issuer is getting the randomization seed to each object. You didn't show the code for how the env classes get constructed and the run method gets called, but I'm assuming you are using OVM/UVM or something similar. The run phases of these classes all get forked in parallel, so your chances of random stability are diminished when using the run phase.

— Dave Rich, Verification Architect, Siemens EDA

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