On 12 April 2010 17:43, Fernando olivero <olive...@lu.unisi.ch> wrote: > Good idea! I had a similar idea when initially worked on Alien loader. > > I think that what is needed also is remove the dependency with the array, i > mean explicitly calling the indexes make the image crash if you didn't had > the assumed special object array size. > > > For example: > Smalltalk registerSpecialObject: myObject with: aName > > And later you reference that special object by aName instead of an > index to the array. > > > So it would be easier to load/unload the packages that extend the special > objects array, because there would be no explicit dependency to indexes. > Yeah, that would be nice. But this will require VM changes.. and therefore is doomed :) Also, this could impact the VM speed significantly, because its using special object quite frequently. Imagine replacing a simple index-based lookup with name(string) based.
> > Fernando > > On Apr 12, 2010, at 4:17 PM, Igor Stasenko wrote: > >> Hello, >> >> i attempted to load Alien-Core package into trunk image, and it failed. >> >> One of the problem is override of recreateSpecialObjectsArray method.. >> >> I wonder, maybe we should design a nicer API for extending/reserving >> slots in special objects array, >> so it won't require overriding this method by every package which >> needs to extend special objects, like FFI or Alien. >> >> Another aspect of replacing this method is , that it makes problematic >> to unload such package, in case one wants to unload it. >> >> So, my proposal is to add a simple API to SmalltalkImage class, and in >> order to install additional special objects one should do like: >> >> MyClass class>>initialize >> >> Smalltalk registerSpecialObject: myObject at: 55. >> Smalltalk registerSpecialObject: myObject at: 56. >> ... >> >> or: >> >> Smalltalk registerSpecialObjects: #( x y z) startingAt: 56. >> >> upon package unload, a reverse scheme should be supported: >> >> >> MyClass class>>unload >> >> Smalltalk unregisterSpecialObjectAt: 55. >> Smalltalk unregisterSpecialObjectAt: 56. >> ... >> >> or: >> >> Smalltalk unregisterSpecialObjects: 3 startingAt: 56. >> >> >> what you think? >> >> -- >> Best regards, >> Igor Stasenko AKA sig. >> >> _______________________________________________ >> Pharo-project mailing list >> Pharo-project@lists.gforge.inria.fr >> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > > > _______________________________________________ > Pharo-project mailing list > Pharo-project@lists.gforge.inria.fr > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > -- Best regards, Igor Stasenko AKA sig. _______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
