Home

Search

Method Manipulation In SV and e PDF Print E-mail
User Rating: / 5
PoorBest 
Thursday, 24 December 2009 16:46

If you're familiar with SystemVerilog and taking your first steps in e (or vice versa) you might find this useful. Here are some of the most common method manipulations that you''ll need to master and how you should go about implementing them in e and SV:

 

Before we dive in - here's the reference code for the examples we're going to show you.

// ** e **
struct my_struct {
 my_function() is {};
 my_task1()@sys.any is {};
 my_task2()@sys.any is {};
 };
// ** SystemVerilog **
class parent;
 // must be virtual
 virtual function my_function();
 endfunction
 virtual task my_task1();
 endtask
 virtual task my_task2();
 endtask
 endclass

OK, now let''s see how to implement the most common method manipulations in each language:


Extending methods - adding more functionality at the end:

// ** e **
 extend parent {
 my_function() is also {
 j++;
 };
 };
 
 // ** SV **
 class child extends parent;
 virtual function my_function();
 super.my_function();
 j++;
 endfunction;
 endclass


Extending methods - adding stuff to the beginning of a method:

// ** e **
 extend parent {
 my_function() is first {
 j++;
 };
 };
 
 // ** SV **
 class child extends parent;
 virtual function my_function();
 j++;
 super.my_function();
 endfunction;
 endclass


Overriding a method:

// ** e **
 extend parent {
 my_function() is only {
 j++;
 };
 };
 
 // ** SV **
 class child extends parent;
 virtual function my_function();
 j++;
 endfunction;
 endclass


Launching parallel threads - parent process not blocked:

// ** e ** 
 foo()@sys.any is {
 start my_task1();
 start my_task2();
 };
 
 // ** SV **
 task foo();
 fork begin 
 my_task1();
 my_task2();
 join_none; 
 endfunction


Launching parallel threads - parent process blocked until shortest thread completes:

// ** e ** 
 foo()@sys.any is {
 first of {
 { my_task1(); };
 { my_task2(); };
 };
 };
 
 // ** SV **
 function foo();
 fork begin 
 my_task1();
 my_task2();
 join_any;
 disable fork;    // remove if you don''t want to kill the longer task prematurely
 endfunction


Launching parallel threads - parent process blocked until all threads are finished:

// ** e ** 
 foo()@sys.any is {
 all of {
 { my_task1(); };
 { my_task2(); };
 };
 };
 
 // ** SV **
 function foo();
 fork begin 
 my_task1();
 my_task2();
 join;
 endfunction

 

 
More articles :

» AutoDup: Create Test Variants Quickly (Free Utility)

Coverage driven verification has a big advantage – you can write a single test, and let run it several times with random seeds. Each run will generate a slightly different scenario – depending on the nature of the constraints you provided....

» Who Wants To Be A Verifier?

Are you looking for a job in verification? Are you pursuing a career in verification? Congratulations! There a few things you might want to consider about your prospective employer before you sign the contract. In today's important article we'll try...

» EndMaker: Make Your SystemVerilog Code Look Professional (Free Utility)

This is a cool little utility that will make your SystemVerilog look much more professional. It simply adds an end-of-method identifier (label) to every task or function so that every endfunction turns into endfunction : function_name (with the...

» Cool Things You Can Do with Verdi

Wow it's been a while, but I'm back with a new series of YouTube videos. Hurray !!This time it's all about Verdi and all the cool things it can do for you.Since most of you guys already know it is the best debugger out there, my goal is to show you...

» Eternal Sunshine of the Verifier's Mind

To be successful in verification you not only need to possess the right technical skills, but you also need to possess the right mindset. Possessing the right mindset will lead you to success rapidly. Here are 3 things that I’ve found very...

Comments  

 
0 #1 2010-04-17 16:43
Very simple and very informative article.
Quote
 

Add comment


Security code
Refresh

Copyright © 2019 Think Verification - Tips & Insights on ASIC Verification. All Rights Reserved.
Joomla! is Free Software released under the GNU/GPL License.