RE: [sv-ec] Queue Methods - return status?

Hi Cliff,

Interesting question. Here are my two cents:

Calling insert() with an invalid index - either larger than $+1, negative, or containing X or Z - behaves the same as any other array write with an invalid, that is, no write is performed and an assertion may be issued.

Calling delete() with an invalid index deletes no element and an assertion may be issued. This behavior is consistent with the above.

Calling pop_front() or pop_back() on an empty queue returns the default uninitialized value for the queue element type, and an assertion may be issued. This is consistent with an array read with an invalid index.

These seem rather natural extensions from other array operations. Nonetheless, it would be good to document them.

        Arturo


-----Original Message-----
From: owner-sv-ec@eda.org [mailto:owner-sv-ec@eda.org] On Behalf Of Clifford E. Cummings
Sent: Tuesday, June 16, 2009 8:35 PM
To: sv-ec@eda.org
Subject: [sv-ec] Queue Methods - return status?

Hi, All -

This question has been posed to me a number of times and I am not
100% sure what the answer should be.

Do the queue methods return any type of status if they fail? Looking
over the LRM (clause 7.11.2 in Ballot Draft), the methods are
described, but unlike mailbox methods, there does not appear to be
any return status, nor is there any description of what should happen
if the called methods fail.

Examples:
insert() method at an index. What happens if you try to insert into a
queue at location 5 if there are only two entries in the queue? And
where is the behavior described. This is a void function.

delete() method at an index. Same type of issue. Deleting an entry
that does not exist.

pop_front() or pop_back() from an empty queue. What happens? Any status?

The push_front(), push_back() and size() methods should all be okay.

Thanks for any thoughts.

Regards - Cliff


----------------------------------------------------
Cliff Cummings - Sunburst Design, Inc.
14314 SW Allen Blvd., PMB 501, Beaverton, OR 97005
Phone: 503-641-8446 / FAX: 503-641-8486
cliffc@sunburst-design.com / www.sunburst-design.com
Expert Verilog, SystemVerilog, Synthesis and Verification Training


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