Filed as Issue 250131.1. https://dwarfstd.org/issues/250131.1.html
Thanks! -cary On Fri, Jan 31, 2025 at 2:20 PM Cary Coutant <ccout...@gmail.com> wrote: > In Section 6.1.1.2, the parent index entry attribute is described as: >> >> Parent debugging information entry, a reference to the index entry for >> the parent. This is represented as the offset of the entry relative to >> the start of the entry pool. >> >> But in Table 6.1, DW_IDX_parent is described as: >> >> Index of name table entry for parent >> >> These two seem to contradict each other. The first one makes more >> sense, as it points to a specific index entry, making it non-ambiguous. >> With the second one, pointing to an name table entry, how to you know >> which of the (possibly multiple) entries associated to that name is the >> parent? >> >> Is is just an honest mistake that should be fixed, or am I missing >> something? >> > > I'm pretty sure it was meant to be a reference to the index entry, not the > name table entry. It looks like the mistake in Table 6.1 dates all the way > back to the first version of the proposal. I'll file this as a new issue > for the committee to discuss. > > -cary > >> >> This caused confusion with the LLVM team here, where it was believed >> that either meaning was acceptable: >> >> >> https://discourse.llvm.org/t/rfc-improve-dwarf-5-debug-names-type-lookup-parsing-speed/74151/16 >> >> In the end, LLVM implemented the "offset to the index entry" approach. >> >> Unfortunately, GDB implemented the "name table index" approach (but Tom >> Tromey noted that it was a curious choice on the part of DWARF, because >> of the ambiguousness, I guess he only saw the Table 6.1 definition). >> However, I believe it should be possible to migrate to the other >> approach, and differentiate which approach is used using the form, on >> the reader side. >> >> Simon >> -- >> Dwarf-discuss mailing list >> Dwarf-discuss@lists.dwarfstd.org >> https://lists.dwarfstd.org/mailman/listinfo/dwarf-discuss >> >
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