On tor, 2018-12-06 at 16:32 +0100, Andreas Arnez via Dwarf-Discuss wrote: > If GDB uses caller-saved register values from the inner-most frame in > outer frames, then this is a bug. Note that this could also be > caused > by bad CFI.
Hmm, right. I'm not very familiar with the design philosophy of GDB, but as far as I have understood it they prefer to rely on producer to emit such information. In the LLVM bug report [0] I wrote for this I mentioned using DW_CFA_undefined for caller-saved registers, or at least for those that it knows are clobbered. Neither GCC nor Clang emits CFI for caller-saved registers at the moment. I have not been successful in finding out why, but my (uneducated) guess is that, maybe at least one of the reasons, is debug info size concerns? [0] https://bugs.llvm.org/show_bug.cgi?id=39752 Best regards, David _______________________________________________ Dwarf-Discuss mailing list Dwarf-Discuss@lists.dwarfstd.org http://lists.dwarfstd.org/listinfo.cgi/dwarf-discuss-dwarfstd.org
