Re: [sv-ec] should shallow copy of a class instance copy the rand_mode settings?

Mantis item 1382 was created for these issues.

Neil



Ryan, Ray wrote On 03/13/06 11:07,:
> For variable assignment, I would expect that the rand_mode
> would NOT be copied. For example:
> 
> class myclass
>    rand int x, y;
> 
>    function void swap();
>       int tmp;
>       tmp = x;
>       x = y;      // y.rand_mode is NOT copied ?
>       y = tmp;
>    endfunction
> endclass
> 
> I would expect the swap function would exchange the 
> VALUES of x,y, but would not change the rand_mode setting
> for x or y.
> 
> Ray
> 
> 
> 
>>-----Original Message-----
>>From: owner-sv-ec@eda.org [mailto:owner-sv-ec@eda.org] On 
>>Behalf Of Arturo Salz
>>Sent: Saturday, March 11, 2006 10:38 PM
>>To: Dickol, John; sv-ec@eda.org
>>Subject: RE: [sv-ec] should shallow copy of a class instance 
>>copy the rand_mode settings?
>>
>>This is a very good point. The LRM does not specify what 
>>happens to the random settings.
>>
>>I think users would expect the rand_mode and constraint_mode 
>>to be copied. The other alternative would be to reset these 
>>settings to their default state in the new object. Either 
>>way, the LRM needs to be specific.
>>
>>	Arturo
>>
>>-----Original Message-----
>>From: owner-sv-ec@eda.org [mailto:owner-sv-ec@eda.org] On 
>>Behalf Of Dickol, John
>>Sent: Saturday, March 11, 2006 10:03 PM
>>To: sv-ec@eda.org
>>Subject: [sv-ec] should shallow copy of a class instance copy 
>>the rand_mode settings?
>>
>>If randomization is disabled for a random variable in a class 
>>instance, and subsequently a shallow copy is made of that 
>>class instance, should randomization also be disabled in the 
>>copy?  For example, in the following code fragment, should I 
>>expect randomization to be disabled for c2.num?  
>>
>>class C;
>>    rand int num;
>>endclass
>>
>>C c1,c2;
>>
>>initial begin
>>   c1 = new;
>>   c1.num.rand_mode(0);  // disable randomization of c1.num
>>
>>   c2 = new c1;          // shallow copy c1 to c2.
>>
>>   assert(c2.randomize); // should c2.num be randomized?
>>end
>>
>>The LRM, section 7.11, says that class properties are copied, 
>>but it's not clear if rand_mode is considered to be a class property.
>>
>>Similarly, should constraint_mode settings be copied?
>>
>>John
>>
>>
>>
> 
> 

-- 
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Neil Korpusik                                     Tel: 408-720-4852
Senior Staff Engineer                             Fax: 408-720-4850
Frontend Technologies - ASICs & Processors (FTAP)
Sun Microsystems
email: neil.korpusik@sun.com
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