[sv-ec] RE: virtual interface variables declarations

Yes, indeed.
I think one can do this (not disallowed by the LRM see mantis 2694) :

interface subIFC;
   integer i = 10;
endinterface

class C;
   virtual interface subIFC vi;
   function new(virtual interface subIFC varg);
        vi = varg;
   endfunction
endclass

interface IFC;
   subIFC i2();

   C hdl = new (i2);
   initial
      $display (hdl.vi);
endinterface

module top;
virtual interface IFC vm;

IFC i1();
initial begin
   $display (vm.hdl.vi.i);

end

endmodule

Seems like there is a loop hole where one can refer to a virtual interface through a virtual
interface. Both IFC abd subIFC are legal interfaces to be assigned to virtual interface variables. I
carefully declared the class datatype in the cuscope.

What was the technical reason for why we disallowed virtual interfaces inside interfaces?

Francoise
       '

________________________________
From: Bresticker, Shalom [mailto:shalom.bresticker@intel.com]
Sent: Wednesday, August 31, 2011 2:11 AM
To: Francoise Martinolle; sv-ec@eda.org
Subject: RE: virtual interface variables declarations

Mantis 2694 also discusses this sentence.

Shalom

From: owner-sv-ec@eda.org [mailto:owner-sv-ec@eda.org] On Behalf Of Francoise Martinolle
Sent: Tuesday, August 30, 2011 6:38 PM
To: sv-ec@eda.org
Subject: [sv-ec] virtual interface variables declarations

I found that the text in section 25.9 describing the limitations for virtual interfaces variables declarations is not
sufficient.
It currently states:

Virtual interfaces shall not be used as ports, interface items, or as members of unions.

Strictly reading this, I would expect I can have a virtual interface variable as a formal of a task/function declared

in an interface or as a variable declared in a scope inside (named begin end block, task/function decl) inside the interface.

However I think the intent was to disallow virtual interfaces completely inside interfaces.

can someone confirm that it was the intent?

interface I4;

I2 i2();

task t ();

static virtual interface I2 t1 = VI2; //Is this illegal?

VI2 = i2;

endtask

endinterface

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