Re: Estimating conversion of Ada 83 to Ada 95

["James E. Hopper" <hopperj@macconnect.com>]

We just finished a conversion from dec ada to gnat, and got nothing
like this!  Now since we had to modify dec ada constructs, you would
expect that  (starlet library for instance was a pain!)  But what i
would say is the same is the testing effort.  unless you already have
working unit tests and results, writing proper tests can take much more
tiem than the actual conversion.  i suppose you could just go straight
to integration testing, but i wouldnt feel comfortable with it.  if it
didnt work your estimates are going to go all to pieces while you go
back and test smaller units!

i would suggest a risk pot that has money to allow for this.  

jim

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In article <7jj9kr$2hr$1@news2.tor.accglobal.net>, Terry J. Westley
<twestley@buffalo.veridian.com> wrote:

> We're converting a 640 KSLOC real-time, distributed simulation from
> Ada 83 (VADS) to Ada 95.  I expect most of the work will be replacing
> VADS-specific packages with Ada 95 library packages and POSIX packages.
> 
> Based on some limited conversion work we've already done, I'm using
> 162 LOC/Hour for converting from VADS to GNAT Ada 95 for those files
> which include lots of special stuff such as OS calls, use of VADS
> packages, use of Oracle Pro*Ada, etc.  For the rest, I figure it'll
> be at least 5 times faster than that, for a conversion rate of
> 812 LOC/Hour.  This includes conversion, compilation, and testing.
> 
> I expect we'll use the GNAT Ada83 switch for the first pass, then
> turn it off to see what happens.
> 
> Anyone have any evidence that I'm way off on this estimate?
> 
> --
> Terry J. Westley, Principal Engineer
> Veridian Engineering, Calspan Operations
> P.O. Box 400, Buffalo, NY 14225
> twestley@buffalo.veridian.com    http://www.veridian.com