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Fix various issues with debug_lines parsing, and support DWARF5 #383

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Fix various issues with debug_lines parsing, and support DWARF5 #383

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Commits on Aug 29, 2024

  1. Fix logic for scanning DW_AT_stmt_list attributes. 

    Do this for all CUs, not just the first one. A previous incarnation of
the DWARF parser didn't seem to separate out the translation units, and
would implicitly iterate all. The change to making compilation units
more visibile seems to have broken this.
    @peadar
    peadar committed Aug 29, 2024
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  2. Fix parsing of DW_AT_ref_udata 

    This attribute is a LEB128 encoded value - decode it as such. Later use
of attributes of this form may need some work, but without parsing it
correctly, we break parsing of further attributes completely.
    @peadar
    peadar committed Aug 29, 2024
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  3. Implement debug_lines parsing for DWARFv5 

    There are some differences between the DWARF4 and DWARF5 .debug_lines
table format. Implement the DWARF5 changes.

Mostly, the changes are to make the parser aware of the more
sophisticated format of the directory and file tables, with some minor
conditional changes in the header itself.
    @peadar
    peadar committed Aug 29, 2024
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