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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: dwz@sourceware.org
Subject: [Bug default/25459] New: Forward pseudo-reference triggers error
Date: Wed, 01 Jan 2020 00:00:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D25459

            Bug ID: 25459
           Summary: Forward pseudo-reference triggers error
           Product: dwz
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: default
          Assignee: nobody at sourceware dot org
          Reporter: vries at gcc dot gnu.org
                CC: dwz at sourceware dot org
  Target Milestone: ---

As we have seen, the test-case in PR25456 triggers an error:
...
$ dwz clang-offload-bundler-10.debug
dwz: clang-offload-bundler-10.debug: Couldn't find DIE referenced by
DW_OP_GNU_implicit_pointer
...=20

However, the question is: should this error be triggered?

We have a DIE in a partial unit:
...
 <3><481a37>: Abbrev Number: 1 (DW_TAG_formal_parameter)
    <481a38>   DW_AT_abstract_origin: <0x5232>
    <481a3c>   DW_AT_location    : 0x902527 (location list)
    <481a40>   DW_AT_GNU_locviews: 0x902525
...
for which we calculate the checksum, so we follow the DW_AT_location to:
...
    00902525 v000000000000000 v000000000000003 location view pair

    00902527 v000000000000000 v000000000000003 views at 00902525 for:
             0000000000000033 0000000000000033 (DW_OP_GNU_implicit_pointer:
<0x1263f86> 0)
...
from where we would like to go to:
...
<1><1263f86>: Abbrev Number: 206 (DW_TAG_dwarf_procedure)
    <1263f88>   DW_AT_location    : 4 byte block: 9e 2 7e 0=20=20=20=20
(DW_OP_implicit_value 2 byte block: 7e 0 )
...
but we can't because the CU containing this DIE hasn't been processed by
read_debug_info.

--=20
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