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 [thread overview]
Message-ID: <bug-25549-6586-8pZ6qjp1vd@http.sourceware.org/bugzilla/> (raw)
In-Reply-To: <bug-25549-6586@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=25549
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 all,
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 it's
an issue because this is a cross-CU abstract_origin reference?
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next prev parent reply other threads:[~2020-05-07 2:06 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-13 15:40 [Bug translator/25549] New: " wcohen at redhat dot com
2020-05-01 18:31 ` [Bug translator/25549] " wcohen at redhat dot com
2020-05-04 20:18 ` wcohen at redhat dot com
2020-05-05 15:41 ` wcohen at redhat dot com
2020-05-05 20:49 ` woodard at redhat dot com
2020-05-07 2:06 ` fche at redhat dot com [this message]
2020-05-07 3:26 ` mark at klomp dot org
2020-05-07 10:27 ` fche at redhat dot com
2020-05-07 10:28 ` fche at redhat dot com
2020-05-07 11:36 ` mark at klomp dot org
2020-05-07 13:58 ` wcohen at redhat dot com
2020-05-07 17:55 ` wcohen at redhat dot com
2020-05-08 10:15 ` mark at klomp dot org
2020-05-08 14:02 ` wcohen at redhat dot com
2020-05-08 17:25 ` mark at klomp dot org
2020-05-08 20:07 ` wcohen at redhat dot com
2020-07-10 3:00 ` fche at redhat dot com
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