Bug 720332 - Wrong DWARF computation?
Summary: Wrong DWARF computation?
Alias: None
Product: Fedora
Classification: Fedora
Component: gdb
Version: 15
Hardware: Unspecified
OS: Linux
Target Milestone: ---
Assignee: Jan Kratochvil
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2011-07-11 12:14 UTC by Jan Kratochvil
Modified: 2011-09-07 00:16 UTC (History)
5 users (show)

Fixed In Version: gdb-7.3-43.fc15
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2011-09-07 00:16:16 UTC

Attachments (Terms of Use)

Description Jan Kratochvil 2011-07-11 12:14:09 UTC
Jakub Jelinek:
I'm seeing something which looks like a gdb bug, at least on F15

volatile int v;
__attribute__((noinline, noclone))
unsigned long long
foo (unsigned long long x)
  unsigned long long j = x * -(0x17ULL << 31);/* { dg-final { gdb-test 12 "j" "-(0x17ULL << 31)" } } */
  return x;
main ()
  return foo (1) - 1;
gdb prints 18446744073709550592 instead of the expected 18446744013580009472
the DWARF has DW_OP_breg5 0 DW_OP_consts -49392123904 DW_OP_mul DW_OP_stack_value for j

(gdb) p/x 18446744073709550592LL
$1 = 0xfffffffffffffc00
(gdb) p/x  18446744013580009472LL
$2 = 0xfffffff200000000

Comment 1 Jakub Jelinek 2011-07-11 13:26:18 UTC
It might be a bug Tom Tromey fixed some time ago in sleb128 parsing in gdb.

Comment 2 Jan Kratochvil 2011-07-11 13:42:58 UTC
[commit] Fix sleb128 reading

Comment 3 Fedora Update System 2011-08-16 17:31:32 UTC
gdb-7.3-43.fc15 has been submitted as an update for Fedora 15.

Comment 4 Fedora Update System 2011-08-17 00:51:22 UTC
Package gdb-7.3-43.fc15:
* should fix your issue,
* was pushed to the Fedora 15 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing gdb-7.3-43.fc15'
as soon as you are able to.
Please go to the following url:
then log in and leave karma (feedback).

Comment 5 Fedora Update System 2011-09-07 00:16:10 UTC
gdb-7.3-43.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.

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