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* [Bug debug/42782] New: VTA missed location: parameter via stack
@ 2010-01-17 21:33 jan dot kratochvil at redhat dot com
2010-01-17 23:23 ` [Bug debug/42782] " jan dot kratochvil at redhat dot com
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: jan dot kratochvil at redhat dot com @ 2010-01-17 21:33 UTC (permalink / raw)
To: gcc-bugs
gcc (GCC) 4.5.0 20100117 (experimental)
x86_64-unknown-linux-gnu running -m32
Reproduced on Fedora 12: gcc-4.4.2-20.fc12.x86_64
--------------------------------------------------------------------------------
extern void g (void);
int
f (int a)
{
g ();
return a;
}
--------------------------------------------------------------------------------
gcc -o 1.o -c -Wall 1.c -m32 -O1 -g -Wall
--------------------------------------------------------------------------------
0: 55 push %ebp
1: 89 e5 mov %esp,%ebp
3: 83 ec 08 sub $0x8,%esp
6: e8 fc ff ff ff call 7 <f+0x7>
b: 8b 45 08 mov 0x8(%ebp),%eax
e: c9 leave
f: c3 ret
--------------------------------------------------------------------------------
Contents of the .debug_info section:
<2><40>: Abbrev Number: 3 (DW_TAG_formal_parameter)
<41> DW_AT_name : a
<49> DW_AT_location : 0x38 (location list)
Contents of the .debug_loc section:
Offset Begin End Expression
00000038 00000000 0000000a (DW_OP_fbreg: 0)
00000038 <End of list>
--------------------------------------------------------------------------------
Offsets 0xb .. 0xf miss the A location.
The function must know it when it returns A.
--------------------------------------------------------------------------------
Practical impact:
Backtrace missed parameters of elf_lookup_lib_symbol() in:
https://bugzilla.redhat.com/show_bug.cgi?id=556310
--
Summary: VTA missed location: parameter via stack
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: debug
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: jan dot kratochvil at redhat dot com
GCC target triplet: i386-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42782
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug debug/42782] VTA missed location: parameter via stack
2010-01-17 21:33 [Bug debug/42782] New: VTA missed location: parameter via stack jan dot kratochvil at redhat dot com
@ 2010-01-17 23:23 ` jan dot kratochvil at redhat dot com
2010-01-18 10:14 ` [Bug debug/42782] [4.5 Regression] " jakub at gcc dot gnu dot org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: jan dot kratochvil at redhat dot com @ 2010-01-17 23:23 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from jan dot kratochvil at redhat dot com 2010-01-17 23:23 -------
Noticed it is a regression against: gcc (GCC) 4.4.3 20100117 (prerelease)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42782
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug debug/42782] [4.5 Regression] VTA missed location: parameter via stack
2010-01-17 21:33 [Bug debug/42782] New: VTA missed location: parameter via stack jan dot kratochvil at redhat dot com
2010-01-17 23:23 ` [Bug debug/42782] " jan dot kratochvil at redhat dot com
@ 2010-01-18 10:14 ` jakub at gcc dot gnu dot org
2010-01-18 10:58 ` jakub at gcc dot gnu dot org
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu dot org @ 2010-01-18 10:14 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from jakub at gcc dot gnu dot org 2010-01-18 10:13 -------
Reproduced. Works with -fno-var-tracking-assignments, and looks to be a
var-tracking.c problem - the testcase doesn't contain (and doesn't need to
contain) any DEBUG_INSNs.
--
jakub at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Keywords| |wrong-debug
Priority|P3 |P2
Last reconfirmed|0000-00-00 00:00:00 |2010-01-18 10:13:58
date| |
Summary|VTA missed location: |[4.5 Regression] VTA missed
|parameter via stack |location: parameter via
| |stack
Target Milestone|--- |4.5.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42782
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug debug/42782] [4.5 Regression] VTA missed location: parameter via stack
2010-01-17 21:33 [Bug debug/42782] New: VTA missed location: parameter via stack jan dot kratochvil at redhat dot com
2010-01-17 23:23 ` [Bug debug/42782] " jan dot kratochvil at redhat dot com
2010-01-18 10:14 ` [Bug debug/42782] [4.5 Regression] " jakub at gcc dot gnu dot org
@ 2010-01-18 10:58 ` jakub at gcc dot gnu dot org
2010-01-19 8:44 ` aoliva at gcc dot gnu dot org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu dot org @ 2010-01-18 10:58 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from jakub at gcc dot gnu dot org 2010-01-18 10:57 -------
The problem is that dataflow_set_preserve_mem_locs and/or
dataflow_set_remove_mem_locs removes all MEMs (with the exception of those
referring to decl with 0 MEM_OFFSET in the first function) upon encountering a
CALL. For parameters (ARG_POINTER_REGNUM based, or even
HARD_FRAME_POINTER_REGNUM based ones I believe) we don't need to remove them,
as long as the decl isn't addressable and thus the call shouldn't have modified
them.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42782
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug debug/42782] [4.5 Regression] VTA missed location: parameter via stack
2010-01-17 21:33 [Bug debug/42782] New: VTA missed location: parameter via stack jan dot kratochvil at redhat dot com
` (2 preceding siblings ...)
2010-01-18 10:58 ` jakub at gcc dot gnu dot org
@ 2010-01-19 8:44 ` aoliva at gcc dot gnu dot org
2010-01-20 22:57 ` jakub at gcc dot gnu dot org
2010-01-22 17:03 ` jakub at gcc dot gnu dot org
5 siblings, 0 replies; 7+ messages in thread
From: aoliva at gcc dot gnu dot org @ 2010-01-19 8:44 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from aoliva at gcc dot gnu dot org 2010-01-19 08:44 -------
Mine (testing a patch)
--
aoliva at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |aoliva at gcc dot gnu dot
|dot org |org
Status|NEW |ASSIGNED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42782
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug debug/42782] [4.5 Regression] VTA missed location: parameter via stack
2010-01-17 21:33 [Bug debug/42782] New: VTA missed location: parameter via stack jan dot kratochvil at redhat dot com
` (3 preceding siblings ...)
2010-01-19 8:44 ` aoliva at gcc dot gnu dot org
@ 2010-01-20 22:57 ` jakub at gcc dot gnu dot org
2010-01-22 17:03 ` jakub at gcc dot gnu dot org
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu dot org @ 2010-01-20 22:57 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from jakub at gcc dot gnu dot org 2010-01-20 22:57 -------
Subject: Bug 42782
Author: jakub
Date: Wed Jan 20 22:57:20 2010
New Revision: 156092
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=156092
Log:
PR debug/42782
* var-tracking.c: Include tree-flow.h.
(mem_dies_at_call): New.
(dataflow_set_preserve_mem_locs): Use it.
(dataflow_set_remove_mem_locs): Likewise.
(dump_var): Renamed from dump_variable. Adjust all callers.
(dump_var_slot): Renamed from dump_variable_slot. Likewise.
* Makefile.in (var-tracking.o): Adjust deps.
* gcc.dg/guality/pr42782.c: New.
Added:
trunk/gcc/testsuite/gcc.dg/guality/pr42782.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/Makefile.in
trunk/gcc/testsuite/ChangeLog
trunk/gcc/var-tracking.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42782
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug debug/42782] [4.5 Regression] VTA missed location: parameter via stack
2010-01-17 21:33 [Bug debug/42782] New: VTA missed location: parameter via stack jan dot kratochvil at redhat dot com
` (4 preceding siblings ...)
2010-01-20 22:57 ` jakub at gcc dot gnu dot org
@ 2010-01-22 17:03 ` jakub at gcc dot gnu dot org
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu dot org @ 2010-01-22 17:03 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from jakub at gcc dot gnu dot org 2010-01-22 17:02 -------
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=42782
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2010-01-22 17:03 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
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2010-01-17 21:33 [Bug debug/42782] New: VTA missed location: parameter via stack jan dot kratochvil at redhat dot com
2010-01-17 23:23 ` [Bug debug/42782] " jan dot kratochvil at redhat dot com
2010-01-18 10:14 ` [Bug debug/42782] [4.5 Regression] " jakub at gcc dot gnu dot org
2010-01-18 10:58 ` jakub at gcc dot gnu dot org
2010-01-19 8:44 ` aoliva at gcc dot gnu dot org
2010-01-20 22:57 ` jakub at gcc dot gnu dot org
2010-01-22 17:03 ` jakub at gcc dot gnu dot org
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