Re: [sv-bc] use before declaration

Forward references to 't' are non-standard. This may be treated as an error in the future. (VER-733)

But it seems to me that when the compiler reach the declaration of t, there are only two possible conclusions:

 

either t was referenced before its declaration, or there is a duplicate declaration.

 

Shalom

 

From: Datta, Kausik [mailto:Kausik_Datta@mentor.com]
Sent: Thursday, December 05, 2013 15:45
To: Bresticker, Shalom; 'SV_BC List'
Subject: RE: [sv-bc] use before declaration

 

Hi

This is because of compiler can only check for this error after reaching endmodule and that check will be based on the relative position of  “t.s” and “t” if they are in the same file or relative time of processing of “t.s” and “t” by the compiler if they are in different files. I don’t think compiler developers will like to add this checking in code.

Thanks                             

Kausik

 

 

From: owner-sv-bc@eda.org [mailto:owner-sv-bc@eda.org] On Behalf Of Radoslaw Nawrot
Sent: Thursday, December 05, 2013 6:34 PM
To: 'Bresticker, Shalom'; 'SV_BC List'
Subject: RE: [sv-bc] use before declaration

 

I think that reference to t  is a selection. Looks that (bacause of  identical syntax) tool's have problem with that. BTW "non-hierarchical " supervene only one time in LRM. Maybe this word should be changed or Glossary should be updated ,

Radek

 

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From: owner-sv-bc@eda.org [mailto:owner-sv-bc@eda.org] On Behalf Of Bresticker, Shalom
Sent: Thursday, December 05, 2013 1:42 PM
To: SV_BC List
Subject: [sv-bc] use before declaration

Hi,

 

Why does the following not fail compilation?

 

module test;

 

wire w = t.s ;

 

struct { logic s; } t;

 

endmodule

 

6.21 says, "A variable declaration shall precede any simple reference (non-hierarchical) to that variable."

 

The reference to t is non-hierarchical, isn't it?

 

Thanks,

Shalom

 

Shalom Bresticker
Communications & Storage Infrastructure Group Silicon Engineering

Intel Jerusalem, Israel
+972  2 589 6582 (office)
+972 54 721 1033 (cell)
http://www.linkedin.com/in/shalombresticker

 

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