> -----Original Message----- > From: Pavel Labath [mailto:lab...@google.com] > Sent: Wednesday, January 17, 2018 8:14 AM > To: jdevliegh...@apple.com; LLVM Dev; LLDB; David Blaikie; Robinson, Paul > Subject: Adding DWARF5 accelerator table support to llvm > > Hello all, > > In <https://reviews.llvm.org/D41986#977215> it was brought up that > there are at least two parties interested in having DWARF5 accelerator > tables implemented, so I'm writing this email to see if there's anyone > else interested in this topic, and to try to synchronize our efforts. > > Our interest for this stems from a desire to make dwarf parsing fast > on non-apple targets (specifically android). As you may know, apple > targets already use a non-standard accelerator table format, which was > a precursor to the dwarf5 one. Due to other differences in debug info > deployment model, the apple tables are not directly applicable to > other targets, so instead of trying to make them fit, we chose to go > with the standard approach. > > I personally will have some time to work on this this quarter or two, > and my plan is roughly the following: > 1. add .debug_names support to llvm-dwarfdump via the DebugInfo > library (to enable testing of the table generation) > 2. add .debug_names generation support (not enabled by default) > 3. add .debug_names support to lldb > 4. validate all three things work together > 5. hook up .debug_names to clang's -glldb flag. > 6. add .debug_names support to lld (accelerator table merging) > > Right now I have (1) roughly implemented, and I think I'll be able to > put it up for review in a couple of days (although I expect the review > will go through several revisions before being accepted). I also have > a very basic implementation of (2), but this is still quite far from > being upstreamable. > > So, my question is whether anyone is planning to work, or maybe > working already on dwarf5 accelerator tables? Help with reviewing > patches would also be greatly appreciated. If you have any questions > or concerns, let me know.
Hi Pavel, This would not interfere/duplicate anything Sony is doing in the near future. I think having the accelerator tables available for our debugger team to play with would be nice, and I will certainly try to spend some time on reviews. FTR, next thing on the Sony list will be the new range-list/loc-list format. We're really hoping to make `-gdwarf-5` a viable thing for debuggers to try out by LLVM 7.0. It won't have "everything" but the basic set of sections should be in place and be syntactically correct. Thanks, --paulr > > regards, > Pavel _______________________________________________ lldb-dev mailing list lldb-dev@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
