+Adrian for Apple/LLDB perspective One way to merge the tests would be to add another command line argument into DwarfDebug (see the way the split-dwarf command line argument is used), just for testing purposes. The command line argument can override the value specified in the metadata - so you can have one input file for the 3 different versions.
On Thu, Jan 28, 2016 at 4:28 PM, Katya Romanova via cfe-commits < cfe-commits@lists.llvm.org> wrote: > kromanova created this revision. > kromanova added reviewers: dblaikie, echristo, probinson. > kromanova added a subscriber: cfe-commits. > kromanova set the repository for this revision to rL LLVM. > > Hello, > The compiler always emits .debug_line version 2, though some opcodes from > DWARF 3 (e.g. DW_LNS_set_prologue_end, DW_LNS_set_epilogue_begin or > DW_LNS_set_isa) and from DWARF 4 could be emitted by the compiler. That's > not exactly right. > > This patch changes version information of .debug_line to exactly match the > DWARF version (which is 4 by default). > For .debug_line version 4, a new field maximum_operations_per_instruction > is emitted. I'm not exactly sure how to set this field correctly for VLIW > architectures. Hopefully, there are some experts in the community that > could help out (any Hexagon debuginfo developers out there?). > > I’ve tried a few tools to check if they could handle .debug_line version 4. > On a simple testcase, I verified that GDB debugger 7.7 understands > .debug_line version 4. > Sony’s proprietary debugger can understand it too. > I don't have LLDB built, so I haven’t tried it. > GCC (older version 4.8.2) still emits version 2 for the .debug_line > section, even though the DWARF version is set to 4. I'm not sure about the > latest GCC. > GNU's readelf (version 2.24) can handle .debug_line version 4. > > I added 3 new tests debug-line-version2.ll, debug-line-version3.ll and > debug-line-version4.ll. The IR is generated from one source using different > options (-gdwarf-2, -gdwarf-3 and –gdwarf-4). Any idea how to merge these > three tests into one? > > Let me know what do you think about the patch. > > > Repository: > rL LLVM > > http://reviews.llvm.org/D16697 > > Files: > lib/MC/MCDwarf.cpp > test/DebugInfo/AArch64/line-header.ll > test/DebugInfo/Generic/debug-line-version2.ll > test/DebugInfo/Generic/debug-line-version3.ll > test/DebugInfo/Generic/debug-line-version4.ll > test/DebugInfo/Generic/empty.ll > test/DebugInfo/X86/empty.ll > test/DebugInfo/X86/stmt-list-multiple-compile-units.ll > test/MC/ELF/debug-line.s > test/MC/ELF/debug-line2.s > test/MC/ELF/debug-loc.s > test/MC/ELF/discriminator.s > test/MC/ELF/empty-dwarf-lines.s > test/MC/MachO/file.s > test/MC/MachO/gen-dwarf.s > test/MC/MachO/loc.s > > > _______________________________________________ > cfe-commits mailing list > cfe-commits@lists.llvm.org > http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits > >
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