Re: [sv-ec] No event triggers in functions?

<forwarding bounced email from Jonathan Bromley>

-------- Original Message --------
Subject: Re: [sv-ec] No event triggers in functions?
Date: Thu, 4 May 2006 00:23:31 +0100
From: "Jonathan Bromley" <jonathan.bromley@doulos.com>
To: <sv-bc@server.eda.org>, <sv-ec@server.eda.org>


Steven Sharp wrote, of static locals of a task:

> Given this, it is technically noncompliant to inline a
> static task or function at a call site using variables
> local to that call site or calling process.  However,
> I wouldn't expect anyone to complain about it.

I think I would complain.  Verilog's subprogram semantics
are bizarre, but entirely consistent; once you've understood
argument passing by copy-in/copy-out, and static locals,
there's a natural tendency to make the best of what you
have.  Given that tasks are local to a module and
instantiated therewith, it's entirely reasonable and
useful to exploit a task's static local storage in
various interesting ways.  In general I would expect
such uses to have been superseded by classes, but the
persistence and per-instance-ness (!) of task/function
locals should not be compromised.

> The sharing of these statics for locals in a static
> task or function is generally considered a potential
> problem to be avoided, not something to rely on.

But if people have learnt to rely on it in creative
but standards-compliant ways...
-- 
Jonathan Bromley
Doulos Ltd



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