[Bug default/29637] New: dzw fails with Unknown DWARF DW_OP_255

[Bug default/29637] New: dzw fails with Unknown DWARF DW_OP_255

[nolange79 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29637

            Bug ID: 29637
           Summary: dzw fails with Unknown DWARF DW_OP_255
           Product: dwz
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: default
          Assignee: nobody at sourceware dot org
          Reporter: nolange79 at gmail dot com
                CC: dwz at sourceware dot org
  Target Milestone: ---

Created attachment 14370
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14370&action=edit
binary reproduzing the bug

dwz fails to process the attached file with 'Unknown DWARF DW_OP_255'

dwz version 0.14

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[Bug default/29637] dzw fails with Unknown DWARF DW_OP_255

[mliska at suse dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=29637

Martin Liska <mliska at suse dot cz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mliska at suse dot cz
             Status|UNCONFIRMED                 |WAITING
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2022-09-29

--- Comment #1 from Martin Liska <mliska at suse dot cz> ---
Confirmed. How did you build the library, can you please share build log?

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[Bug default/29637] dzw fails with Unknown DWARF DW_OP_255

[jakub at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29637

Jakub Jelinek <jakub at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at redhat dot com

--- Comment #2 from Jakub Jelinek <jakub at redhat dot com> ---
This is while processing of
 <10><16d34>: Abbrev Number: 12 (DW_TAG_variable)
    <16d35>   DW_AT_abstract_origin: <0x63976>
    <16d39>   DW_AT_location    : 0x29d51 (location list)
    <16d3d>   DW_AT_GNU_locviews: 0x29d47
and seems even readelf -wo shows total garbage for that:
    00029d51 v000000000000001 v000000000000000 views at 00029d47 for:
             000000000000af34 000000000000b10b (DW_OP_implicit_value 16 byte
block: ff ff ff ff ff ff ff ff 30 b1 0 0 0 0 0 0 )
    00029d75 v000000000000000 v000000000000000 views at 00029d49 for:
             000000000000b161 ffffffff109e0012 ((User defined location op
0xff))
    00039d86 v000000000000000 v000000000000000 views at 00029d4b for:
             e201000000000000 e2000000000000cb ((Unknown location op 0x0))
(start > end)
    00039e63 v000000000000000 v000000000000000 views at 00029d4d for:
             d64e9f7b80910004 d686000000000000 ()
    00039e75 v000000000000000 v000000000000000 views at 00029d4f for:
             8091000400000000 0000000000009f7b () (start > end)
    00039e87 v000000000000034 v00000000000002f views at 00029d51 for:
             0000000000000000 0000cc1100000001 ()
    00039e99 v000000000000000 v000000000000000 views at 00029d54 for:
             00000000cc480000 00d64e5e00010000 ()
    00039eab v000000000000000 v000000000000000 views at 00029d56 for:
             000000d686000000 00005e0001000000 ()
    00039ebd v000000000000000 v00000000000000b views at 00029d58 for:
             0000000000000000 0000000100000000 ((Unknown location op 0x0))
    00046ae0 v000000000000031 v000000000000000 views at 00029d5a for:
             0000000000000000 0000436000000000 ()
    00046af2 v000000000000000 v000000000000000 views at 00029d5d for:
             0000000043690000 0043695500010000 ()
    00046b04 v000000000000000 v000000000000000 views at 00029d5f for:
             000000436e000000 436e560001000000 ()
    00046b16 v000000000000012 v000000000000000 views at 00029d61 for:
             0000437300000000 7355000100000000 ((Unknown location op 0x0))
    00046b6b v00000000000081e v30ffffffffffffff views at 00029d63 for:
             00000000004fe100 00004fe154000100 ()
    00046b7d v000000000000031 v000000000000000 views at 00029d6e for:
             000000004fe20000 9f5501f300040000 ()
    00046b8f <End of list>

Bet GCC emitted there DW_OP_implicit_value 16 with just 8 bytes of data after
it.
I vaguely remember fixing some issues like this, I think e.g.
https://gcc.gnu.org/PR99562 and
https://gcc.gnu.org/PR103046
Anyway, doesn't seem like a dwz bug to me.

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