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* [Bug default/25459] Forward pseudo-reference triggers error
  2020-01-01  0:00 [Bug default/25459] New: Forward pseudo-reference triggers error vries at gcc dot gnu.org
@ 2020-01-01  0:00 ` vries at gcc dot gnu.org
  2021-03-12 10:56 ` vries at gcc dot gnu.org
  1 sibling, 0 replies; 3+ messages in thread
From: vries at gcc dot gnu.org @ 2020-01-01  0:00 UTC (permalink / raw)
  To: dwz

https://sourceware.org/bugzilla/show_bug.cgi?id=25459

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
There are few things to consider here:
- It would be good to be able to handle a forward pseudo-reference. Presumably
  such a thing would be handled by doing two passes over .debug_info, much like
  is done in low-mem mode. This ties in somewhat with PR25229 - "Add input
  verification phase".
- another question is whether dwz should generate the code such as is present
in
  clang-offload-bundler-10.debug. If this was a normal reference, the
referenced
  DIE would have been forced into a partial unit. Should we do the same for
  pseudo-references?

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* [Bug default/25459] New: Forward pseudo-reference triggers error
@ 2020-01-01  0:00 vries at gcc dot gnu.org
  2020-01-01  0:00 ` [Bug default/25459] " vries at gcc dot gnu.org
  2021-03-12 10:56 ` vries at gcc dot gnu.org
  0 siblings, 2 replies; 3+ messages in thread
From: vries at gcc dot gnu.org @ 2020-01-01  0:00 UTC (permalink / raw)
  To: dwz

https://sourceware.org/bugzilla/show_bug.cgi?id=25459

            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
... 

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    
(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.

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* [Bug default/25459] Forward pseudo-reference triggers error
  2020-01-01  0:00 [Bug default/25459] New: Forward pseudo-reference triggers error vries at gcc dot gnu.org
  2020-01-01  0:00 ` [Bug default/25459] " vries at gcc dot gnu.org
@ 2021-03-12 10:56 ` vries at gcc dot gnu.org
  1 sibling, 0 replies; 3+ messages in thread
From: vries at gcc dot gnu.org @ 2021-03-12 10:56 UTC (permalink / raw)
  To: dwz

https://sourceware.org/bugzilla/show_bug.cgi?id=25459

Tom de Vries <vries at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |27568


Referenced Bugs:

https://sourceware.org/bugzilla/show_bug.cgi?id=27568
[Bug 27568] Add initial .debug_info reading phase to dwz
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