[fpc-devel] Interface scope incompatibility with Delphi
jonas.maebe at elis.ugent.be
Wed Nov 10 11:54:42 CET 2010
On 10 Nov 2010, at 11:40, Graeme Geldenhuys wrote:
> I'm still searching the archives.
mail-archive.com is currently not responding for me, but the thread is
(it will probably come back online later today).
There's also a long discussion on the same topic at http://bugs.freepascal.org/view.php?id=9472
> Mind you tell me what would be so bad in
> this case to be delphi compatible? Is there actually any negative
> points to it?
Ensuring compatibility with undocumented code generator details
require large amounts of work, and moreover can be completely in vain
if Delphi's behaviour changes later on.
In this case, the work would entail determining *under all
circumstances* where exactly Delphi creates temporary interfaces and
where not, and where the refcounts are increased and decreased. See
the bug report and thread above for how Delphi's behaviour is not the
same under all circumstances either (because of limitations in inter-
procedural analysis -- it's quite possible that when inlining some
function calls, Delphi's behaviour will also change). Then you have to
adapt the FPC code generator so that it performs the same
optimizations as Delphi does under the same circumstances (not more,
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