[Bug tools/30772] New: dwarflint checking for specification recursion

[Bug tools/30772] New: dwarflint checking for specification recursion

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30772

            Bug ID: 30772
           Summary: dwarflint checking for specification recursion
           Product: elfutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tools
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

This idea comes from this thread:

https://sourceware.org/pipermail/gdb-patches/2023-August/201655.html

The idea is that if a DIE refers to itself via a chain
of DW_AT_specification (or the other ways a DIE can refer
to another), then dwarflint ought to warn, as recursion like
this is never valid.

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[Bug tools/30772] dwarflint checking for specification recursion

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30772

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> ---
libdw dwarf_attr_integrate does prevent cycles by limiting the chain of
DW_AT_abstract_origin and DW_AT_specification to 16 (arbitrary number).

On a different level, DW_AT_import can also create cycles (or rather infinite
imports). __libdw_visit_scopes does contain some cycle detection.

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