RE: [sv-ec] mantis item 2848

Good. If the vendors agree that it should be an error, I think we will
be ok.
It is not very useful anyways to declare a class inside an interface. 

Francoise
    '

-----Original Message-----
From: Gordon Vreugdenhil [mailto:gordonv@model.com] 
Sent: Thursday, August 13, 2009 6:31 PM
To: Francoise Martinolle
Cc: sv-ec@server.eda.org
Subject: Re: [sv-ec] mantis item 2848

Francoise,

This is where the "type" nature of interfaces really breaks down.  I
agree with the issue -- there is no definite type for "vi.ch" since the
referenced type is dependent on the instance of the target.  Most such
issues were resolved by the introduction of parameterized virtual
interface typing, but strong types (classes, unions, enums, structs) are
not addressed by the current LRM.  The "best" argument that I can make
is that since the types are not statically determinable, it should
probably be an error.  It is certainly going to be ill-defined across
vendors at this point.

Gord.


Francoise Martinolle wrote:
> I filed a mantis item today regarding virtual interfaces which can get

> assigned interfaces containing class declarations.
> I think it should be illegal to traverse through such virtual 
> interface to a class handle declared in the interface if its class 
> datatype is also in the interface declaration.
> The datatype of the virtual interface select expression cannot be 
> statically determined by the elaborator.
> ex:
> interface ifc;
>    class C;
>    int i;
>    endclass
>      C ch;
>    
> endinterface // ifc
> 
> module top;
> 
>    ifc ifc1();
> 
>    ifc ifc2();
>    
>    virtual interface ifc vi = ifc1;
>    
>    initial begin
>       vi.ch = new(); // is this legal
>       $display(vi.ch.i); // is this legal?
>       vi = ifc2;
>       $display (vi.ch.i);
>    end
> 
> endmodule // top
>  
> Comments?
>  
> Francoise
>        '
> 
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Gordon Vreugdenhil                                503-685-0808
Model Technology (Mentor Graphics)                gordonv@model.com


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