Well,
I got confused by example
illegal_loc_var_formal.
Now, I also think the text is incorrect. But I think this text has some
meaning
when users do not specify ‘local’ in the formal’s type. In
the last paragraph of 16.8.2, it says “Untyped arguments provide
an alternative mechanism for
passing local variables to an instance of a subsequence, including the
capability to assign to the local variable in the subsequence and later
reference the value assigned in the instantiation context”.
So, from this it looks like,
either users have to specify type
along with ‘local’ in the formal or it has to be untyped if it is
used as local variable.
Thanks.
Manisha
Where
does the
text in 16.8.2 say, or even imply, that this rule applies only if the
argument is used as an output, but not as inout?
From:
owner-sv-ac@server.eda.org [mailto:owner-sv-ac@server.eda.org] On
Behalf Of Kulshrestha,
Manisha
Sent: Wednesday, December 31, 2008 1:51 PM
To: Surya Pratik Saha; sv-ac@server.eda.org
Subject: RE: [sv-ac] Example shown in LRM contradicts local
variable
restriction
Hello
Surya,
Please
check clause 16.8.2 for more details. The example below
is correct and also the text. The rule that the ‘corresponding formal
argument shall be untyped’ only applies if the argument is used as
output
(i.e. it is only assigned but not read). There are few examples in
16.8.2 which
make it more clear. Since this example and the text are from different
sections
and from different mantis items, it is confusing.
Manisha
Hi,
In SV 2009 draft LRM, there is an example:
sequence sub_seq2(local inout int lv);
(a ##1 !a, lv += data_in)
##1 !b[*0:$] ##1 b && (data_out == lv);
endsequence
sequence seq2;
int v1;
(c, v1 = data)
##1 sub_seq2(v1) // lv is initialized by assigning it the value of v1;
// when the instance sub_seq2(v1) matches, v1 is
// assigned the value of lv
##1 (do1 == v1);
endsequence
And later it is mentioned:
It can be useful to assign a value to a local variable within an
instance of a
named sequence and reference the
local variable in the instantiating context at or after the completion
of a
match of the instance. This capability
is supported under the following conditions:
— The local variable shall be declared outside the named sequence, and
its scope shall include both the
instance of the named sequence and the desired reference in the
instantiating
context.
— The local variable shall be passed as an entire actual argument in
the
list of arguments of the
instance of the named sequence.
— The corresponding formal argument shall be untyped.
Whereas, in the example corresponding formal argument 'lv' is not
untyped for
local variable 'v1'. Am I missing anything?
--
Regards
Surya
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