[Bug default/29441] New: name demangling should not be done on variable names

["gprocida at google dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29441

            Bug ID: 29441
           Summary: name demangling should not be done on variable names
           Product: libabigail
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: default
          Assignee: dodji at redhat dot com
          Reporter: gprocida at google dot com
                CC: libabigail at sourceware dot org
  Target Milestone: ---

Hi Dodji.

We noticed some odd output with abidw --annotate. Simple C++ code like:

struct A { int x; };
A v;

results in the annotation for A:

<!-- void -->

This is because "v" as a type demangles to "void". There is no way to turn off
this behaviour at the abi::__cxa_demangle level.

The fix is to ensure that *only* mangled names are passed to the function.

All callers to demangle_cplus_mangled_name are at risk of giving incorrect
results, including compare_symbol_name which itself has a few callers.

One issue is that symbol name is copied into linkage_name (if absent) so the
presence of linkage_name cannot be used indicator of a name being mangled.

If linkage_name cannot be relied on, then it may be possible to only attempt to
demangle C++ function linkage names and nothing else.

Giuliano.

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