This is the mail archive of the
elfutils-devel@sourceware.org
mailing list for the elfutils project.
[Bug tools/24550] eu-readelf does not know about DW_AT_GNU_{bias,numerator,denumerator}
- From: "tromey at sourceware dot org" <sourceware-bugzilla at sourceware dot org>
- To: elfutils-devel at sourceware dot org
- Date: Wed, 15 May 2019 18:02:35 +0000
- Subject: [Bug tools/24550] eu-readelf does not know about DW_AT_GNU_{bias,numerator,denumerator}
- Auto-submitted: auto-generated
- References: <bug-24550-10460@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=24550
--- Comment #3 from Tom Tromey <tromey at sourceware dot org> ---
> > There are three things that surprised me about this.
> > First that the byte_size is 1, are these types really using a full byte and
> > not 2 or 6 bits?
>
> I'm not totally sure what is going on here. Maybe the type needs to be
> used in a packed record to see it actually shrink? I will see if I can write
> a test for this.
Thanks for noticing this. I think the DWARF is incorrect here in a few
ways -- I am going to update the internal bug about it to get it fixed.
Meanwhile here is the updated test case I am using
-- Copyright 2019 Free Software Foundation, Inc.
--
-- This program is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation; either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program. If not, see <http://www.gnu.org/licenses/>.
procedure Bias is
type Small is range -7 .. -4;
for Small'Size use 2;
Y : Small := -5;
Y1 : Small := -7;
type Byte is mod 256;
type Repeat_Count_T is new Byte range 1 .. 2 ** 6;
for Repeat_Count_T'Size use 6;
X : Repeat_Count_T := 64;
X1 : Repeat_Count_T := 1;
type Char_Range is range 65 .. 68;
for Char_Range'Size use 2;
Cval : Char_Range := 65;
type SomePackedRecord is record
R: Small;
S: Small;
end record;
pragma Pack (SomePackedRecord);
SPR : SomePackedRecord := (R => -4, S => -5);
type Packed_Array is array (1 .. 3) of Small;
pragma pack (Packed_Array);
A : Packed_Array := (-7, -5, -4);
begin
null;
end Bias;
--
You are receiving this mail because:
You are on the CC list for the bug.