[sv-ac] RE: binding checkers

If you think of a bind instantiation statement as simply being transplanted to the target scope, character by character, sort of like a macro call, then it seems a lot less spooky.

Shalom

> -----Original Message-----
> From: owner-sv-ac@eda.org [mailto:owner-sv-ac@eda.org] On Behalf Of
> John Havlicek
> Sent: Monday, September 23, 2013 20:56
> To: Bresticker, Shalom; Kulshrestha, Manisha
> Cc: sv-ac@eda-stds.org
> Subject: [sv-ac] RE: binding checkers
> 
> Resolving the name of the thing to be instantiated in the target scope
> seems spooky to me.
> 
> I'd feel better if some name resolution experts had a look and gave
> opinions.
> 
> J.H.
> 
> -----Original Message-----
> From: Bresticker, Shalom [mailto:shalom.bresticker@intel.com]
> Sent: Monday, September 23, 2013 1:56 AM
> To: Kulshrestha, Manisha; John Havlicek
> Cc: sv-ac@eda-stds.org
> Subject: RE: binding checkers
> 
> Agreed.
> 
> I see two points here:
> 
> 1. While checkers can be bound like modules and interfaces, they are
> not in the global name space like modules and interfaces.
> 2. Bind instantiation statements have target scope visibility of
> declarations in the target scope and of declarations imported into the
> target scope, but not from $unit.
> 
> It might be possible to relax one or both of those restrictions.
> 
> Shalom
> 
> > -----Original Message-----
> > From: Kulshrestha, Manisha [mailto:Manisha_Kulshrestha@mentor.com]
> > Sent: Monday, September 23, 2013 09:36
> > To: Bresticker, Shalom; John Havlicek
> > Cc: sv-ac@eda-stds.org
> > Subject: RE: binding checkers
> >
> > Hi Shalom,
> >
> > I agree with you that as per this statement in LRM, the checker name
> > should be resolved as per target scope. But the reason I raised this
> > question was that this behavior does not look very user friendly for
> > checkers. Especially for the checkers in packages as it will require
> > the targets to be modified to import checker packages.
> >
> > Dimitry, do you want to give your input on this?
> >
> > Thanks.
> > Manisha
> >
> > -----Original Message-----
> > From: Bresticker, Shalom [mailto:shalom.bresticker@intel.com]
> > Sent: Sunday, September 22, 2013 7:46 PM
> > To: John Havlicek; Kulshrestha, Manisha
> > Cc: sv-ac@eda-stds.org
> > Subject: RE: binding checkers
> >
> > I disagree.
> >
> > The LRM says,
> >
> > "When an instance is bound into a target scope, the effect will be as
> > if the instance was present at the very end of the target scope."
> >
> > So I think the checker name is resolved in the context of the target,
> > not the bind statement.
> >
> > In the first example, I would say that ch1 binds to A.ch1.
> > In the second example, I would say that it is an error as no ch1 is
> > visible in A.
> >
> > Regards,
> > Shalom
> >
> > > -----Original Message-----
> > > From: owner-sv-ac@eda.org [mailto:owner-sv-ac@eda.org] On Behalf Of
> > > John Havlicek
> > > Sent: Friday, September 20, 2013 17:46
> > > To: Kulshrestha, Manisha
> > > Cc: sv-ac@eda-stds.org
> > > Subject: [sv-ac] RE: binding checkers
> > >
> > > Hi Manisha:
> > >
> > > My quick, intuitive reactions are the following.
> > >
> > > For the bind instantiation of a checker whose declaration is nested
> > > within a module, I would try to follow the rules for instantiating
> > > other things, like modules, whose declarations can be nested within
> a
> > > module.  Potentially, configurations may come into play in the
> > > resolution of the name ch1.  I would say that the name of the
> checker
> > > must be resolved in the context of the bind statement, not in the
> > > target context.
> > >
> > > For the example of checker declared in a package, I think the
> import
> > > should be required only insofar as it is needed to resolve the name
> > ch1
> > > of the checker (if it is needed at all).  I do not think the import
> > > affects the meaning of global references, say, in the declaration
> of
> > > ch1 to items in the package.  In any event, I would follow the
> rules
> > of
> > > packages for other items, like tasks and functions, that can be
> > > declared in a package and have global references there.
> > >
> > > Best regards,
> > >
> > > John H.
> > >
> > > -----Original Message-----
> > > From: owner-sv-ac@eda.org [mailto:owner-sv-ac@eda.org] On Behalf Of
> > > Kulshrestha, Manisha
> > > Sent: Friday, September 20, 2013 12:20 AM
> > > To: sv-ac@eda-stds.org
> > > Subject: [sv-ac] binding checkers
> > >
> > > Hi All,
> > >
> > > LRM allows instantiating checkers in another module using bind
> > > construct. But it is not clear how it would be decided which
> checker
> > to
> > > pickup.
> > >
> > > Here is an example:
> > >
> > > module A;
> > >
> > > checker ch1;
> > > ....
> > > endchecker
> > >
> > > ....
> > > endmodule
> > >
> > > module B;
> > >
> > > checker ch1;
> > > ....
> > > endchecker
> > >
> > > bind A ch1 U1(); <===
> > > endmodule
> > >
> > > It is not clear which ch1 it should pick up? One in A or B?
> > >
> > > As per bind section, all the symbols in the port list are resolved
> in
> > > the target scope. What about the name of the checker?
> > >
> > > Here is another example which is more interesting:
> > >
> > > package p1;
> > > checker ch1;
> > > ...
> > > endchecker
> > > endpackage
> > >
> > > module A;
> > > ....
> > > endmodule
> > >
> > > module B;
> > > import p1::*; <<== should this be needed for the bind to work
> > > bind A ch1 U1(); <===
> > > endmodule
> > >
> > > Here is some text from the LRM:
> > > "When an instance is bound into a target scope, the effect will be
> as
> > > if the instance was present at the very end
> > > of the target scope. In other words, all declarations present in
> the
> > > target scope or imported into the target
> > > scope are visible to the bound instance. Wildcard import candidates
> > > that have been imported into the scope
> > > are visible, but a bind statement cannot cause the import of a
> > wildcard
> > > candidate. Declarations present or
> > > imported into $unit are not visible in the bind statement."
> > >
> > > So, the bind statement should be effectively as if 'ch1 U1()' is
> > > written at the end of module A. But, A does not import anything
> from
> > > package p1 so effectively ch1 is not visible in A. Does that mean
> it
> > is
> > > an error or tools should take care of this scenario?
> > >
> > > I would like to know what others think about these usages.
> > >
> > > Thanks.
> > > Manisha
> >
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> > Intel Israel (74) Limited
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