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  • Is Super.new() in derived class constructor optional ???

Is Super.new() in derived class constructor optional ???

SystemVerilog 6308
super.new 1 systemverilog 33
shivabachu
shivabachu
Full Access
11 posts
May 28, 2015 at 10:39 pm

Hi All,

I got a unexpected (maybe to me it is strange) result from the fallowing code

class base;
 
  function new();
    $display("PARENT CLASS CONSTRUCTOR\n");
  endfunction
endclass
 
class child extends base;
  function new();
    $display("CHILD CLASS CONSTRUCTOR");
  endfunction
endclass
 
initial begin
child c;
c= new();
end

/*******RESULT****/
PARENT CLASS CONSTRUCTOR
CHILD CLASS CONSTRUCTOR

Is super.new in derived class is optional !!!
then why we write super.new() always in derived class constructor, is there any advantage of doing so ?

thanks in advance

Replies

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Sushrut Veerapur
Sushrut Veerapur
Forum Access
38 posts
May 28, 2015 at 10:58 pm

From SV 1800-2012 LRM:

A super.new call shall be the first statement executed in the constructor. This is because the superclass shall be initialized before the current class and, if the user code does not provide an initialization, the compiler shall insert a call to super.new automatically.

dave_59
dave_59
Forum Moderator
10658 posts
May 28, 2015 at 11:05 pm

Please use code tags to make you code more readable. I have added them for you.
The LRM says:

IEEE 1800-2012 wrote:
A super.new call shall be the first statement executed in the constructor. This is because the superclass shall be initialized before the current class and, if the user code does not provide an initialization, the compiler shall insert a call to super.new automatically.

Normally you need to explicitly call super.new(..) to deal with required construct arguments. The one that is implicitly inserted has no arguments. Even if you have no constructor arguments, it is always a good idea to explicitly call super.new() to make your code more readable.

— Dave Rich, Verification Architect, Siemens EDA

shivabachu
shivabachu
Full Access
11 posts
May 28, 2015 at 11:10 pm

In reply to Sushrut Veerapur:

thanks sushrut

shivabachu
shivabachu
Full Access
11 posts
May 28, 2015 at 11:12 pm

In reply to dave_59:

thanks dave,
i tried to find for the code tags , But i did not any link . please provide the link to know about the code tags.

sivasyammj
sivasyammj
Forum Access
6 posts
May 29, 2015 at 1:26 am

Dave, I think we should call super.new(), when there is an arguments in the new function !! if we are newing with out any arguments we can avoid super.new()
-sivajsyamm

dave_59
dave_59
Forum Moderator
10658 posts
May 29, 2015 at 8:13 am

In reply to shivabachu:

Look at the right-most button above the dialog box where you type your message. OR read https://verificationacademy.com/forums/announcements/please-format-your-code-code-and/code-tags

— Dave Rich, Verification Architect, Siemens EDA

dave_59
dave_59
Forum Moderator
10658 posts
May 29, 2015 at 8:20 am

In reply to sivasyammj:

SystemVerilog is full of default implicit rules that are very hard to remember, as indicated by the original question. Most of the time you are going to need to call super.new with arguments anyways. If you use a methodology like UVM, you will wind up calling it nearly 100% of the time.

I think it is just easier to remember calling super.new 100% of the time.

— Dave Rich, Verification Architect, Siemens EDA

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