vsk added inline comments.
================ Comment at: lldb/test/API/functionalities/tail_call_frames/disambiguate_paths_to_common_sink/main.cpp:8 + // FROM-FUNC1-NEXT: func1 + // FROM-FUNC1-SAME: [artificial] + // FROM-FUNC1-NEXT: main ---------------- dblaikie wrote: > vsk wrote: > > labath wrote: > > > labath wrote: > > > > dblaikie wrote: > > > > > vsk wrote: > > > > > > labath wrote: > > > > > > > vsk wrote: > > > > > > > > Are these test updates necessary because lldb doesn't print > > > > > > > > '[opt]' and '[artificial]' next to frame descriptions in a > > > > > > > > consistent way across platforms? Or is it just that you don't > > > > > > > > think matching '[opt]' is relevant to the test? > > > > > > > Right, I wanted to mention that as it's not very obvious, but I > > > > > > > forgot... > > > > > > > > > > > > > > The `[opt]` thingy is not printed at all with -ggdb because the > > > > > > > attribute we get this information from -- DW_AT_APPLE_optimized > > > > > > > -- is only emitted for -glldb. The optimization flag did not seem > > > > > > > very relevant for these tests (I mean, technically the compiler > > > > > > > could emit call site attributes even in non-optimized mode) so > > > > > > > instead of forking the expectations I chose to simply remove it. > > > > > > Sounds good. > > > > > As an aside, now that lldb understands these attributes - perhaps we > > > > > should emit them under -glldb as well as -ggdb? (@aprantl might be > > > > > interested in making that call) > > > > FWIW, I think that would be great as it would reduce the effects of the > > > > debugger tuning argument, making the compiler output more "portable". > > > > > > > > Though, we may want to wait with that until I look at the -1 issue. I > > > > believe that the way this is implemented now means we will end up > > > > pointing to the middle of a call instruction in an artificial frame, > > > > which would be a slight regression. It's not the end of the world, but > > > > I believe we can do something slightly better. > > > Ok, I take that back. The instruction pointer handling is not terribly > > > consistent right now anyway: > > > ``` > > > (lldb) up > > > frame #1: 0x0000000000401210 a.out`func12(...) > > > (lldb) register read rip > > > rip = 0x0000000000401300 > > > ``` > > > > > > So, I wouldn't worry too much about preserving behavior here. > > I don't see any concrete benefit to supporting -ggdb on Darwin. Actually, > > changing llvm to emit the GNU opcodes on Darwin seems bad to me, as it > > could force Darwin tools authors to support two sets of call-site related > > opcodes. > Not sure what it would mean to "support -ggdb on Darwin" - it's supported in > that some peolpe might be using gdb on Darwin & compile that way. But I meant > emitting these when targeting lldb - which someone might be doing on any > platform & they might still want to use DWARFv4 for whatever reason - or does > DWARFv4 + -glldb already use the DWARFv5 call site opcodes? If so, then, > sure, that sounds OK to me & I don't suppose there's much reason to emit the > GNU ones instead. If DWARFv4 + -glldb doesn't emit any call site info, it > seems like an improvement to emit the GNU extension (consumers should always > be written to ignore tags/attributes they don't know - and if so they'll be > no worse off than if the call site info hadn't been emitted) or the v5 > attributes maybe (though I don't know that that's quite as valid - I guess a > consumer could rightly reject tags/attributes that aren't in the extension > number space, or in the standard number space for the version being parsed) Yep, DWARFv4 + -glldb emits DWARFv5 call site opcodes -- and I should have written (as I meant), 'there's no need to change this to behave like -ggdb under -gdwarf-4 mode on Darwin'. It should (remain!) possible to use -ggdb on Darwin. Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D80519/new/ https://reviews.llvm.org/D80519 _______________________________________________ lldb-commits mailing list lldb-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-commits
