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OOPS and UVM

UVM 5595
OOPS 2 #uvm 242
verif_learner
verif_learner
Forum Access
391 posts
January 13, 2018 at 3:48 am

Many of the OOPS principles are already taken care very well due to UVM methodology.
As an user of UVM or testbench writer, what principles of OOPS should I keep in mind.
Examples will help.

I remember the following OOPS principles:
- encapsulate what varies
- subclasses should be substitutable for base classes
- classes should be open for extension but closed for modification
- depend on abstractions and not on concrete classes

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MayurKubavat
MayurKubavat
Full Access
223 posts
January 18, 2018 at 8:42 am

In reply to verif_learner:

Going into UVM base class library we would know how each OOP principal is used for different purpose, which I did not try my myself.

An OOP principal I liked is SRP(Single Responsibility Principal) as I've seen enough of testbenches where user adds all the responsibility to a single class which is sometimes harder to debug/reuse.

However I would like to know other practices that an user follows when creating testbench either keeping re-usability in mind or for ease of debug!

www.linkedin.com/in/mayurkubavat

verif_learner
verif_learner
Forum Access
391 posts
January 18, 2018 at 7:10 pm

In reply to MayurKubavat:

Quote:
In reply to verif_learner:

However I would like to know other practices that an user follows when creating testbench either keeping re-usability in mind or for ease of debug!

Another one in OOPS concept or design pattern is, strategy pattern.
Here is what I have digested after reading design patterns.

If a functional class has to be implemented then cleanly separate out interface and the core function/algorithm. Now, abstract out the interface so that is it not rightly coupled with core function/algorithm. While doing this, think if algorithm A is replaced with algorithm B, would the classes interfacing with this class remain unchanged.

Now, later, if you have to replace Algo A with B then classes interfacing this class should ideally survive. However, if interface was tightly couple with core function, it is almost likely that when Algo A is replaced with Algo B, one would invariably touch the interfacing classes.

As a trivial example, if I want a class to create IP packets, I can have the following API calls:

1) select type of IP packet
2) prepare IP header
3) prepare IP data
4) optionally corrupt IP packet etc.

But later, if I change IP packet with something else, the changes could be needed in the interfacing classes. So, instad of the above APIs, I now name then as follows

1) select layer 3 packet type
2) prepare header
3) prepare payload
4) optionally corrupt

Now, the chances of changes in interfacing classes would be minimum if not zero.

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