RE: [sv-bc] Query related with life time of variable declared inside automatic module/interface.

Packages are the same as modules. I mentioned in October that packages are missing in the list. In 1800-2009, checkers are also in the list.

Also, the use of an 'automatic' lifetime qualifier does not turn the module, interface, or package itself into automatic, in contrast to tasks and functions.

Shalom

________________________________
From: Dhiraj Kumar Prasad [mailto:dhiraj@cal.interrasystems.com]
Sent: Wednesday, December 02, 2009 8:55 AM
To: Bresticker, Shalom
Cc: sv-bc@server.eda.org; Surya Pratik Saha
Subject: Re: [sv-bc] Query related with life time of variable declared inside automatic module/interface.

Hello Shalom,

Thanks for your reply. One more query related with package with life time in draft P1800-2009,
the behavior for the variable declared inside automatic package should be same as that of module
/interface/program or like task/function.

Regards,
dhiRAj



Bresticker, Shalom wrote:

The LRM wording is quite deliberate. The lifetime qualifier of modules and interfaces does not affect variables declared outside subroutines and code blocks. The LRM has this additional text,

"An optional qualifier can be used to specify the default lifetime of all variables declared in a task, function, or block defined within a module, interface, package, or program. The lifetime qualifier is automatic or static. The default lifetime is static.

program automatic test ;
        int i; // not within a procedural block - static
        task t ( int a );  // arguments and variables in t are automatic
                ...                 // unless explicitly declared static
        endtask
endprogram"


Shalom



-----Original Message-----
From: owner-sv-bc@server.eda.org<mailto:owner-sv-bc@server.eda.org>
[mailto:owner-sv-bc@server.eda.org] On Behalf Of Dhiraj Kumar Prasad
Sent: Wednesday, December 02, 2009 8:07 AM
To: sv-bc@server.eda.org<mailto:sv-bc@server.eda.org>
Cc: Dhiraj Kumar Prasad; Surya Pratik Saha
Subject: [sv-bc] Query related with life time of variable
declared inside automatic module/interface.

Hello,

I have query regarding the lifetime of variable declared inside the
automatic module/interface.

According to LRM P1800-2005,section  6.6

"SystemVerilog data declared inside a module or interface,
but outside a
task, process, or
 function, are local in scope and static in lifetime (exist for the
lifetime of the module or
 interface). This is roughly equivalent to C static data declared
outside a function, which
 is local to a file."

But don't say anything about the lifetime of variable when
it's declared
inside automatic
module/interface.

The above section should be consider both for static and automatic
lifetime or it's oversight
as different standard simulator are behaving in different way for the
following testcase.

Testcase
---------

module automatic top(output int out1);
    bot I1(out1);//treating out1 as automatic so showing error for
continuous assignment on automatic variable.
endmodule

module bot(output int out1);
endmodule

Regards,
dhiRAj


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