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* [Bug symtab/25969] New: Ignoring .debug_aranges with clang .debug_names
@ 2020-05-11 9:10 vries at gcc dot gnu.org
2020-05-11 9:41 ` [Bug symtab/25969] " vries at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: vries at gcc dot gnu.org @ 2020-05-11 9:10 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=25969
Bug ID: 25969
Summary: Ignoring .debug_aranges with clang .debug_names
Product: gdb
Version: HEAD
Status: NEW
Severity: normal
Priority: P2
Component: symtab
Assignee: unassigned at sourceware dot org
Reporter: vries at gcc dot gnu.org
Target Milestone: ---
[ Spinoff PR of PR25941 . ]
Consider the patch and test-case submitted in
https://sourceware.org/pipermail/gdb-patches/2020-May/168179.html .
That is, test-case test.c:
...
int
main (void)
{
int sum,a,b;
sum = a + b;
return sum;
}
...
Compiled liked so:
...
$ clang-10 test.c -gdwarf-5 -o test.out -gpubnames
..
When loading into gdb, we have:
...
$ gdb test.out
warning: Section .debug_aranges in /data/gdb_versions/devel/test.out entry at
offset 0 debug_info_offset 0 does not exists, ignoring .debug_aranges.
...
The .debug_aranges warning triggers because the .debug_aranges section contains
one entry:
...
debug_aranges contents:
Address Range Header: length = 0x0000002c, version = 0x0002, cu_offset =
0x00000000, addr_size = 0x08, seg_size = 0x00
[0x00000000004003c0, 0x00000000004003eb)
...
which refers to the CU at offset 0, but the CU list (based on the CU list in
.debug_names) only contains the one at 0xc7, so we fail to find it.
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^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug symtab/25969] Ignoring .debug_aranges with clang .debug_names
2020-05-11 9:10 [Bug symtab/25969] New: Ignoring .debug_aranges with clang .debug_names vries at gcc dot gnu.org
@ 2020-05-11 9:41 ` vries at gcc dot gnu.org
2020-09-22 6:18 ` sourav0311 at gmail dot com
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: vries at gcc dot gnu.org @ 2020-05-11 9:41 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=25969
--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
AFAIU, to fix this, we'll have to do a top-level scan of the CUs, and build
partial symbols for CUs are not contained in any index.
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^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug symtab/25969] Ignoring .debug_aranges with clang .debug_names
2020-05-11 9:10 [Bug symtab/25969] New: Ignoring .debug_aranges with clang .debug_names vries at gcc dot gnu.org
2020-05-11 9:41 ` [Bug symtab/25969] " vries at gcc dot gnu.org
@ 2020-09-22 6:18 ` sourav0311 at gmail dot com
2023-12-05 21:04 ` tromey at sourceware dot org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: sourav0311 at gmail dot com @ 2020-09-22 6:18 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=25969
Sourabh Singh Tomar <sourav0311 at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sourav0311 at gmail dot com
--- Comment #2 from Sourabh Singh Tomar <sourav0311 at gmail dot com> ---
GDB when trying to parse `debug_names` also parses `debug_aranges`
section, however `debug_aranges` section is not generated/present
in `clang-trunk` generated executables. This warning is the result
of GDB not checking whether the section is even present/empty.
clang version 12.0.0
$clang -gdwarf-5 -gpubnames test.c
$readelf -S a.out | awk /debug/
[24] .debug_abbrev PROGBITS 0000000000000000 000009a4
[25] .debug_info PROGBITS 0000000000000000 000009ed
[26] .debug_str_offset PROGBITS 0000000000000000 00000a46
[27] .debug_str PROGBITS 0000000000000000 00000a6e
[28] .debug_addr PROGBITS 0000000000000000 00000af5
[29] .debug_names PROGBITS 0000000000000000 00000b08
[30] .debug_line PROGBITS 0000000000000000 00000b78
[31] .debug_line_str PROGBITS 0000000000000000 00000be1
A quick fix could be:
```
static void
create_addrmap_from_aranges (dwarf2_per_objfile *per_objfile,
struct dwarf2_section_info *section)
{
/*If section is empty(or not present) bail out early.*/
if (section->empty ())
return;
```
Because anyway we are bailing out after emitting the warning:
```
if (!insertpair.second)
{
warning (_("Section .debug_aranges in %s has duplicate "
"debug_info_offset %s, ignoring .debug_aranges."),
objfile_name (objfile), sect_offset_str (per_cu->sect_off));
return;
}
```
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^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug symtab/25969] Ignoring .debug_aranges with clang .debug_names
2020-05-11 9:10 [Bug symtab/25969] New: Ignoring .debug_aranges with clang .debug_names vries at gcc dot gnu.org
2020-05-11 9:41 ` [Bug symtab/25969] " vries at gcc dot gnu.org
2020-09-22 6:18 ` sourav0311 at gmail dot com
@ 2023-12-05 21:04 ` tromey at sourceware dot org
2023-12-06 9:29 ` cvs-commit at gcc dot gnu.org
2023-12-06 9:36 ` vries at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: tromey at sourceware dot org @ 2023-12-05 21:04 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=25969
Tom Tromey <tromey at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tromey at sourceware dot org
--- Comment #3 from Tom Tromey <tromey at sourceware dot org> ---
(In reply to Sourabh Singh Tomar from comment #2)
> A quick fix could be:
FWIW the work in bug #24820 has a patch sort of like this;
though I suspect this will be fixed earlier by the
pending patch.
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^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug symtab/25969] Ignoring .debug_aranges with clang .debug_names
2020-05-11 9:10 [Bug symtab/25969] New: Ignoring .debug_aranges with clang .debug_names vries at gcc dot gnu.org
` (2 preceding siblings ...)
2023-12-05 21:04 ` tromey at sourceware dot org
@ 2023-12-06 9:29 ` cvs-commit at gcc dot gnu.org
2023-12-06 9:36 ` vries at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2023-12-06 9:29 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=25969
--- Comment #4 from Sourceware Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom de Vries <vries@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=b17ef9dcd8d16eedf4e60565cd7701698b5a0b6b
commit b17ef9dcd8d16eedf4e60565cd7701698b5a0b6b
Author: Tom de Vries via Gdb-patches <gdb-patches@sourceware.org>
Date: Wed Dec 6 10:29:17 2023 +0100
[gdb/symtab] Redo "Fix assert in set_length"
This reverts commit 1c04f72368c ("[gdb/symtab] Fix assert in set_length"),
due
to a regression reported in PR29572, and implements a different fix for
PR29453.
The fix is to not use the CU table in a .debug_names section to construct
all_units, but instead use create_all_units, and then verify the CU
table from .debug_names. This also fixes PR25969, so remove the KFAIL.
Approved-By: Tom Tromey <tom@tromey.com>
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29572
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=25969
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^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug symtab/25969] Ignoring .debug_aranges with clang .debug_names
2020-05-11 9:10 [Bug symtab/25969] New: Ignoring .debug_aranges with clang .debug_names vries at gcc dot gnu.org
` (3 preceding siblings ...)
2023-12-06 9:29 ` cvs-commit at gcc dot gnu.org
@ 2023-12-06 9:36 ` vries at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: vries at gcc dot gnu.org @ 2023-12-06 9:36 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=25969
Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |15.1
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Tom de Vries <vries at gcc dot gnu.org> ---
Fixed.
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2020-05-11 9:10 [Bug symtab/25969] New: Ignoring .debug_aranges with clang .debug_names vries at gcc dot gnu.org
2020-05-11 9:41 ` [Bug symtab/25969] " vries at gcc dot gnu.org
2020-09-22 6:18 ` sourav0311 at gmail dot com
2023-12-05 21:04 ` tromey at sourceware dot org
2023-12-06 9:29 ` cvs-commit at gcc dot gnu.org
2023-12-06 9:36 ` vries at gcc dot gnu.org
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