[fpc-devel] RTTI interface & variant late binding issue (mORMot)

silvioprog silvioprog at gmail.com
Sun Mar 22 18:52:23 CET 2015

On Sun, Mar 22, 2015 at 6:38 AM, Michael Van Canneyt <michael at freepascal.org
> wrote:
> On Sun, 22 Mar 2015, Alfred wrote:
>> Hello again to all,
>> I am enjoying variant late binding AND interface RTTI for a while now !
>> Thanks again !
>> As far as I know, the patch for RTTI has not yet been included in trunk.
>> But correct me if I am wrong.
>> I would like to ask to include the RTTI patch for i386 in trunk.
>> With i386 interface RTTI, FPC is on level with Kylix for the RTTI part.
>> To ease introduction, I would like to suggest to include a new
>> HASINTERFACERTTI flag, which will let the FPC user know, the new RTTI is
>> available for use.
>> At this moment, it will only be i386.
> I can't remember when I last used i386 code. Must have been more than 10
> years ago.
>  But I hope also ARM will be included in the trunk.
>> On my Raspberry Pi2, the new RTTI works flawless.
> The core developers are divided on the approach to take. Hence it is not
> yet included.
> The code is highly non-portable, which means that each platform must be
> maintained separately.
> This means additional pressure on people who maintain these other
> platforms.
> The idea is to use a manager approach (as for instance for threads,
> locale, widestrings)
> using a libffi wrapper as fallback for platforms for which no native
> manager is available.
> (see https://sourceware.org/libffi/)

It seems that somebody implemented that in FPC:


Not tested yet.

> However this means the RTTI info must be written in a format that can be
> fed directly to libffi.
> (or using a conversion routine). In each case, additional work is needed.
> My - and Florian Klaempfl's, if I understood correctly - idea is to
> include what exists, and then modify the code as needed so it can work with
> libffi. Others fear that this will mean the ffi wrapper will not get
> written anytime soon.
> Michael.

Silvio Cl├ęcio
My public projects - github.com/silvioprog
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