Hi, thanks for support ;) I have to look into the other things mentioned in the thread and decide how to proceed with this idea. > > we are however lost when we have pointer to those struct since there > > is no means describing "there is no memory location for this pointer, > > but it would be pointing to this structure" except for my > > aforementioned hack of unpeeling references/pointers. > > Uhh... I get the impression that, if the struct could be fully SRAed, > that's because any pointers to it were determined to be totally dead, in > which case not having debug info for it is perfectly legitimate > (complete and correct, as per the VTA criteria).
Actually this is quite common scenario: you have local object where all methods get inlined. Then you used to have tons of THIS pointers to the object that was optimized out and each time you step into some of the inlined methods you are lost in providing access to it. I found this very common in tramp3d backtraces. Naturally it seems important to be able to inspect values stored in the object. My little hack with turning the THIS pointer into variable aliasing the original object sort-of works, but full dump of the object appears in backtrace and there are other ill effects so better solution would be welcome :). However this is one of items we probably can think about later... > > Or are you speaking of cases in which the struct is only temporarily > SRAed, with the pieces put back in place whenever a pointer that could > point to it is dereferenced? This case would be tricky to handle, > indeed. This case will be difficult to handle, since it appears decoposed in some places and composed in others. I guess this can be handled by extension of variable tracking: if variable tracking was able to realize the SRA-ed out objects it could be able to handle location list for the whole structure, but it is tricky and by far not that common case as the fully temporary objects I believe. Honza > > -- > Alexandre Oliva http://www.lsd.ic.unicamp.br/~oliva/ > You must be the change you wish to see in the world. -- Gandhi > Be Free! -- http://FSFLA.org/ FSF Latin America board member > Free Software Evangelist Red Hat Brazil Compiler Engineer
