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From: "fche at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug translator/25549] Systemtap unable to find many probe points
 available in code compiled with LTO enable
Date: Thu, 07 May 2020 02:06:49 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D25549

Frank Ch. Eigler <fche at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fche at redhat dot com,
                   |                            |mark at klomp dot org

--- Comment #4 from Frank Ch. Eigler <fche at redhat dot com> ---
It appears the root cause is a mismatch between two parts of systemtap,
a srcfile enumeration pass (taking dwarf_getsrcfiles() in
dfwlpp::collect_srcfiles_matching), and the filtering of dwarf_decl_file()'s
against that list.

In the LTO case, the quasi-inlined copy of main() has no decl_* parts at al=
l,
since those are in the abstract_origin DIEs.  For some reason,
dwarf_decl_file(func) in query_dwarf_func() returns 0, which will not match=
 any
of the elements in the filtered_srcfiles[].  I'd expect it to return a legit
value because it seems to have a dwarf_attr_integrate call inside.  Maybe i=
t's
an issue because this is a cross-CU abstract_origin reference?

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