I've attached a pdf that shows some cases of current usage of the line table directory and file arrays and of indexes.
clang seems (with my limited access to other compilers) the outlier in treating a index of 0 (from file [N] to the directory) as a 0 origin references. Only 0-origin for DWARF5. So reserving 0 as an index to the directories table to mean 'no directory available' would seem to be the right course. The standard (or an errata, if we do such a thing) needs works to establish 1-origin for these indexes into the directory table and clarifies the 1-origin indexes by referencing such in more places in the document. A tar.gz of the test setup is available by email if anyone cares. It is about 1 MiB in size (most of the size is in two ancient IRIX Elf files).. David Anderson
SummaryLineTablesNoted.pdf
Description: Adobe PDF document
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