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* [Bug debug/45103] New: DW_OP_reg* has too large valid range for noreturn funcs
@ 2010-07-28 9:54 jan dot kratochvil at redhat dot com
2010-07-28 9:55 ` [Bug debug/45103] " jan dot kratochvil at redhat dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: jan dot kratochvil at redhat dot com @ 2010-07-28 9:54 UTC (permalink / raw)
To: gcc-bugs
Use -g -O2.
DW_OP_reg5 is there valid for each PC, despite there si a `call' and reg5 is
caller-saved register. Its value therefore gets corrupted in the callee.
FAIL all these:
gcc (GCC) 4.6.0 20100724 (experimental)
gcc (GCC) 4.5.1 20100728 (prerelease)
gcc (GCC) 4.4.5 20100724 (prerelease)
gcc-4.4.4-10.fc13.x86_64
GNU gdb (GDB) 7.2.50.20100724-cvs
#0 breakat (q=0) at 1.c:7
#1 0x000000000040053b in f (a1=<value optimized out>, a2=2, a3=3, a4=4, a5=5,
a6=6, a7=7) at 2.c:6
#2 0x00000000004004fc in g (x=0) at 1.c:14
^^^ x=10 here, it should be <value optimized out>
#3 0x000000000040051e in main () at 2.c:14
==> 1.c <==
#include <stdlib.h>
extern __attribute__((noreturn)) void f (long a1, long a2, long a3, long a4,
long a5, long a6, long a7);
__attribute__((noreturn)) void
breakat (long q)
{
exit (0);
}
__attribute__((noinline)) void
g (long x)
{
f (x, 2, 3, 4, 5, 6, 7);
}
==> 2.c <==
extern __attribute__((noreturn)) void breakat (long q);
__attribute__((noreturn)) void
f (long a1, long a2, long a3, long a4, long a5, long a6, long a7)
{
breakat (0);
}
extern __attribute__((noinline)) void g (long x);
int
main (void)
{
g (10);
return 0;
}
--
Summary: DW_OP_reg* has too large valid range for noreturn funcs
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: jan dot kratochvil at redhat dot com
GCC target triplet: x86_64-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45103
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug debug/45103] DW_OP_reg* has too large valid range for noreturn funcs
2010-07-28 9:54 [Bug debug/45103] New: DW_OP_reg* has too large valid range for noreturn funcs jan dot kratochvil at redhat dot com
@ 2010-07-28 9:55 ` jan dot kratochvil at redhat dot com
2010-07-28 10:03 ` jakub at gcc dot gnu dot org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: jan dot kratochvil at redhat dot com @ 2010-07-28 9:55 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from jan dot kratochvil at redhat dot com 2010-07-28 09:54 -------
Created an attachment (id=21331)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21331&action=view)
.s files for x86_64-unknown-linux-gnu.
GDB bug (probably invalid):
http://sourceware.org/bugzilla/show_bug.cgi?id=11838
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45103
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug debug/45103] DW_OP_reg* has too large valid range for noreturn funcs
2010-07-28 9:54 [Bug debug/45103] New: DW_OP_reg* has too large valid range for noreturn funcs jan dot kratochvil at redhat dot com
2010-07-28 9:55 ` [Bug debug/45103] " jan dot kratochvil at redhat dot com
@ 2010-07-28 10:03 ` jakub at gcc dot gnu dot org
2010-07-28 17:00 ` jakub at gcc dot gnu dot org
2010-09-07 22:46 ` jakub at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: jakub at gcc dot gnu dot org @ 2010-07-28 10:03 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from jakub at gcc dot gnu dot org 2010-07-28 10:03 -------
Created an attachment (id=21332)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21332&action=view)
gcc46-pr45103.patch
For noreturn calls that end the function we were ignoring even
NOTE_DURING_CALL_P notes, thinking they don't affect any instructions.
While they don't affect any instructions in the current function, they affect
instructions in the called function.
--
jakub at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |jakub at gcc dot gnu dot org
|dot org |
Status|UNCONFIRMED |ASSIGNED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45103
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug debug/45103] DW_OP_reg* has too large valid range for noreturn funcs
2010-07-28 9:54 [Bug debug/45103] New: DW_OP_reg* has too large valid range for noreturn funcs jan dot kratochvil at redhat dot com
2010-07-28 9:55 ` [Bug debug/45103] " jan dot kratochvil at redhat dot com
2010-07-28 10:03 ` jakub at gcc dot gnu dot org
@ 2010-07-28 17:00 ` jakub at gcc dot gnu dot org
2010-09-07 22:46 ` jakub at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: jakub at gcc dot gnu dot org @ 2010-07-28 17:00 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from jakub at gcc dot gnu dot org 2010-07-28 17:00 -------
Subject: Bug 45103
Author: jakub
Date: Wed Jul 28 17:00:06 2010
New Revision: 162646
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=162646
Log:
PR debug/45103
* dwarf2out.c (dwarf2out_var_location): Always consider
NOTE_DURING_CALL_P notes, even when not followed by real instructions.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/dwarf2out.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45103
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug debug/45103] DW_OP_reg* has too large valid range for noreturn funcs
2010-07-28 9:54 [Bug debug/45103] New: DW_OP_reg* has too large valid range for noreturn funcs jan dot kratochvil at redhat dot com
` (2 preceding siblings ...)
2010-07-28 17:00 ` jakub at gcc dot gnu dot org
@ 2010-09-07 22:46 ` jakub at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: jakub at gcc dot gnu dot org @ 2010-09-07 22:46 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from jakub at gcc dot gnu dot org 2010-09-07 22:46 -------
Fixed.
--
jakub at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45103
^ permalink raw reply [flat|nested] 5+ messages in thread
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2010-07-28 9:54 [Bug debug/45103] New: DW_OP_reg* has too large valid range for noreturn funcs jan dot kratochvil at redhat dot com
2010-07-28 9:55 ` [Bug debug/45103] " jan dot kratochvil at redhat dot com
2010-07-28 10:03 ` jakub at gcc dot gnu dot org
2010-07-28 17:00 ` jakub at gcc dot gnu dot org
2010-09-07 22:46 ` jakub at gcc dot gnu dot org
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