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  1.  Home
  2. RPG400-L
  3. October 2002

Re: add to *Null pointer does not throw an exception.

Steve Richter wrote:
>
> So is the "no exception when adding to a *Null pointer" behavior by design
> of RPG or a bug?  I dont find a mention in the RPG reference manual.
>

Well, it's not by explicit intent of RPG.  We don't generate any special
code to get this behaviour.

I don't know if that makes it a bug though.  It may be that pointer
arithmetic is done just on the 16-byte variable itself, without the
check for pointerness, for performance reasons, leaving the
pointer-check for later when the pointer is dereferenced.

Of course, the RPG compiler -could- do a check for a null-pointer and
issue an exception, but we would have to think twice and three times
about breaking compatibility before we did that.  (I think it's very
unlikely that we would change this behaviour.)

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