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From: "mark at klomp dot org" <sourceware-bugzilla@sourceware.org>
To: dwz@sourceware.org
Subject: [Bug default/27363] Emit more detailed diagnostic output for
 "Unknown DWARF"
Date: Sun, 21 Feb 2021 16:38:57 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27363

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mark at klomp dot org

--- Comment #1 from Mark Wielaard <mark at klomp dot org> ---
The following commits address some of difficulty tracking down where the bad
DWARF was detected. They don't go so far as your suggestions, but I believe
they are already useful. Trying to get more information than the current (D=
IE)
offsets might also be tricky when we are dealing with bad DWARF.

commit 1e2beb218060515eb1e4f54a0ff6b3714b532e31 (HEAD -> master)
Author: Mark Wielaard <mark@klomp.org>
Date:   Sun Feb 21 16:55:17 2021 +0100

    Print abbrev or DIE offset for Unknown DWARF error message.

            * dwz.c (read_abbrev): Add .debug_abbrev offset to error messag=
e.
            (read_exprloc): Print DIE offset that referenced the unknown
            operand in error message.
            (read_expr_low_mem_phase1): Likewise.
            (read_debug_info): Add die_offset to error messages for unknown
            forms, attributes extending beyond end of CU or unknown block
            form attributes.

    https://sourceware.org/bugzilla/show_bug.cgi?id=3D27363

commit 4705796eb538761db37d5e4ef42171f08c394a65
Author: Mark Wielaard <mark@klomp.org>
Date:   Tue Jan 26 21:12:18 2021 +0100

    Add DIE offsets in error messages to make it easier to find what is wro=
ng.

    With the following patch dwz will give a message like:

    libmozjs-78.so: Couldn't find DIE at [bd6b507] referenced by
      DW_AT_abstract_origin from DIE at [bd5bb9b]

    Which makes it a easier to figure out what is going on.

    In the above case you can simply lookup the producer of the CU for those
    two DIEs. Which turned out the be "clang LLVM (rustc version 1.49.0)"
    which seems to have gotten the abstract origin reference wrong.

            * dwz.c (read_exprloc): Add DIE offsets to error messages.
            (checksum_die): Likewise.

--=20
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