[sv-bc] Re: [sv-ec] !, && and || operators allowed for virtual interface or event or chandle variables

Hi Dave,

In the sv-bc mail list (subject: List of operators allowed on class 
object) I have found
a mail where you mentioned that !,&& and || logical operators are valid 
for class handle variable .
But it is contradicting the table 11-1 in draft 4.
Most of the simulators are passing  !,&& and || logical operators for 
class handle variable .
So  simulator behavior is illegal in this context?

Thanks and regards,
Moumita


Rich, Dave wrote:

>Those operators are currently not legal any for data type that accepts
>null as a value. See table 11-1 in draft 4. For example, you must write
>your first expression as
>
>initial begin
>         if ((vi3!=null) || (vi1!=null))
>
>There has been some discussion about the meaning of
>
>if (vi3)
>
>which the LRM says is equivalent to
>
>if (vi3 !=0)
>
>and would clearly be illegal, but most implementations already accept
>that.
>
>Dave
>
>
>
>  
>
>>-----Original Message-----
>>From: owner-sv-ec@server.eda.org [mailto:owner-sv-ec@server.eda.org]
>>    
>>
>On
>  
>
>>Behalf Of Moumita
>>Sent: Monday, March 10, 2008 12:51 AM
>>To: sv-bc; sv-ec
>>Subject: [sv-ec] !, && and || operators allowed for virtual interface
>>    
>>
>or
>  
>
>>event or chandle variables
>>
>>Hi,
>>
>>!, && and || operators are allowed for class handle variable as null
>>    
>>
>can
>  
>
>>be
>>assigned to any class handle variable.
>>
>>And null can also be assigned to any virtual interface or event or
>>    
>>
>chandle
>  
>
>>variable
>>So  !, && and || operators should be allowed for these variables too.
>>So if we have a testcase -
>>    I1 i1();
>>    virtual i1 vi1 = null;
>>    virtual i1 vi3 = null;
>>    chandle d, a   ;
>>    event e1, e2 = null;
>>
>>    initial begin
>>        if (vi3 || vi1)  //|| operaor is used with virtual interface
>>variable
>>	begin
>>	end
>>        if( d && a)  //&& operator is used with chandle variable
>>	begin
>>        end
>>        if(!e1) // ! operator is used with event varaible
>>        begin
>>        end
>>    end
>>endmodule
>>
>>interface I1;
>>endinterface
>>
>>
>>Is there any issue for these cases?
>>
>>Thanks and regards,
>>Moumita
>>
>>
>>
>>
>>
>>--
>>This message has been scanned for viruses and
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>>    
>>
>
>
>
>
>
>  
>




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