Mark> To make it possible to quickly see whether an address (range) is covered Mark> by an ELF file containing DWARF information two proposals were made:
I finally read through this thread. Cary> I think it's fine for a consumer to first assume that the Cary> .debug_aranges table is complete, but if an address lookup fails, then Cary> it can scan the .debug_info section, hopping from one CU/TU to the Cary> next, looking for CUs that aren't covered by .debug_aranges tables. Cary> Having the debug_info length field in the aranges table would help, Cary> but even then, it's not clear to me how much it will help. The idea was to avoid having to scan all the CUs just because a bad address was given. However, the completeness property is probably more important for by-name indices, where you don't want a single typo to destroy whatever performance gain you get from an index. For addresses maybe someone can make gdb also use the ld.so map to figure out where an address ought to be searched for. I don't believe this is done currently, though I am not certain. That said, on the whole I think it's probably fine to drop this proposal. While this remains a bit of a hole in DWARF, in practice we run dwz on everything in the distro and it can fix up issues like this. Tom _______________________________________________ Dwarf-Discuss mailing list [email protected] http://lists.dwarfstd.org/listinfo.cgi/dwarf-discuss-dwarfstd.org
