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From: "wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug translator/29037] Systemtap unable to find struct bitfield
 members for gcc11 compiled code
Date: Fri, 01 Jul 2022 17:39:22 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29037

William Cohen <wcohen at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |28334

--- Comment #5 from William Cohen <wcohen at redhat dot com> ---
Added code to
https://sourceware.org/git/?p=3Dsystemtap.git;a=3Dshortlog;h=3Drefs/heads/w=
cohen/pr29037
 to translate the DW_AT_data_bit_offset attributes into equivalent
DW_AT_data_member_location attributes.  With the patches the reproducer now
works:

$ sudo ../systemtap_write/install/bin/stap -v fields_probes.stp -c "./field=
s a
a a"
Pass 1: parsed user script and 483 library scripts using
336212virt/96308res/17160shr/78904data kb, in 120usr/30sys/151real ms.
Pass 2: analyzed script: 1 probe, 2 functions, 0 embeds, 0 globals using
337796virt/99060res/18240shr/80488data kb, in 10usr/0sys/5real ms.
Pass 3: using cached
/root/.systemtap/cache/82/stap_82e99d289011359ab6eb47f65e883ee3_1612.c
Pass 4: using cached
/root/.systemtap/cache/82/stap_82e99d289011359ab6eb47f65e883ee3_1612.ko
Pass 5: starting run.
a.icsk_ca_state: true
a.icsk_ca_initialized: true
a.icsk_ca_setsockopt: true
a.icsk_ca_dst_locked: false
$a->icsk_ca_state =3D 1
Pass 5: run completed in 10usr/30sys/365real ms.


The code to handle the newer bitfield DWARF encoding needs to be cleaned up=
 as
it never frees the memory from the mallocs.


Referenced Bugs:

https://sourceware.org/bugzilla/show_bug.cgi?id=3D28334
[Bug 28334] cannot handle offset into register
--=20
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