RE: [sv-ac] RE: feedback to P1800 WG on ballot issues

From: Bresticker, Shalom <shalom.bresticker_at_.....>
Date: Thu Apr 16 2009 - 04:36:49 PDT
True, but the name is still misleading.

Shalom

________________________________
From: Havlicek John-R8AAAU [mailto:john.havlicek@freescale.com]
Sent: Tuesday, April 14, 2009 5:31 PM
To: Bresticker, Shalom; Korchemny, Dmitry; sv-ac@server.eda.org
Cc: Havlicek John-R8AAAU
Subject: RE: [sv-ac] RE: feedback to P1800 WG on ballot issues

Hi Shalom:

There is semantic meaning to sequence_actual_arg.

This semantic meaning is the right meaning both for a sequence actual argument and a sequence default argument.

Our point of view has been that a default argument is a particular kind of actual argument -- it is the actual argument that is bound to the formal argument in case no actual argument is written in the sequence instantiation.

The same rules apply whether or not the sequence actual argument is a default, with the exception that name resolution for a default is from the scope of the declaration of the sequence rather than the scope of the instantiation of the sequence.

J.H.

________________________________
From: owner-sv-ac@eda.org [mailto:owner-sv-ac@eda.org] On Behalf Of Bresticker, Shalom
Sent: Tuesday, April 14, 2009 1:20 AM
To: Korchemny, Dmitry; sv-ac@server.eda.org
Subject: [sv-ac] RE: feedback to P1800 WG on ballot issues

The point is that they don't use "actual_function_argument".
The use of "actual" is confusing.
By your argument, sequence_actual_arg is also inconsistent with tasks and functions, which use simply 'expression'.
Note for example that there are many types of 'identifier' that all reduce to 'identifier'.
For example,

array_identifier ::= identifier

block_identifier ::= identifier

Each is used where the semantics match the name, even though they are syntactically identical. array_identifier is not used for blocks, and block_identifier is not used for arrays.

On the other hand, 'identifier' and 'expression' are generic names with no semantic information about where they are used. They could be used anywhere they are syntactially correct. But if you use a name that has some semantic meaning, then you should not use it where the meaning does not match its use.


Regards,
Shalom
________________________________
From: Korchemny, Dmitry
Sent: Tuesday, April 14, 2009 9:13 AM
To: Bresticker, Shalom; sv-ac@server.eda.org
Subject: RE: feedback to P1800 WG on ballot issues

Hi Shalom,

But the tasks and functions do not use default_function_argument, do they?

Dmitry

From: Bresticker, Shalom
Sent: Tuesday, April 14, 2009 7:57 AM
To: Korchemny, Dmitry; sv-ac@server.eda.org
Subject: RE: feedback to P1800 WG on ballot issues

Hi,

87  - Mantis 2649: sequence_actual_arg is used to represent the default argument
SV-AC believes that there is no added value in introducing a new non-terminal identical to sequence_actual_arg.  It would also introduce an inconsistency between the BNF of sequences on the one hand, and the BNF of properties, functions, and tasks on the other hand. Therefore SV-AC recommends to leave the text unchanged.
[SB] Why would this be inconsistent with tasks and functions? Tasks and function BNFs use simply "expression" for default values. Module port defaults use "constant_expression". Neither uses "actual" for "default".

As for properties, yes, the same problem exists in the property BNF. I personally agree with the comment, though I did not submit it.

Shalom

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Received on Thu Apr 16 04:39:24 2009

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