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From: Florian K. <fl...@ei...> - 2015-03-24 15:07:52
|
On 24.03.2015 15:35, Philippe Waroquiers wrote: > Did the warning appear specifically with this revision ? Yes. Backing out r15036 makes the warning disappear. > I tried on a recent platform (gcc 4.9.2, Fedora 21, s390) > after having added -Warray-bounds but no warning obtained. > > This looks however a false positive to me: > n_fixed is the nr of elements initialised in the array. > So, 0 .. n_fixed-1 can be used > And the condition to stop the loop is i+1 < n_fixed. > So, it looks to me that fixed[i+1] will be ok. > Yes. correct. Looks like a GCC bug. My default gcc is gcc (Ubuntu 4.8.2-19ubuntu1) 4.8.2 which produces the warning. I built 4.9.2 and with that version the warning disappears. Florian |
|
From: Philippe W. <phi...@sk...> - 2015-03-24 14:34:44
|
On Tue, 2015-03-24 at 14:25 +0100, Florian Krohm wrote: > On 23.03.2015 22:49, sv...@va... wrote: > > Author: philippe > > Date: Mon Mar 23 21:49:32 2015 > > New Revision: 15036 > > > > I'm seeing: > > m_transtab.c: In function 'unchain_in_preparation_for_deletion': > m_transtab.c:619:36: warning: array subscript is above array bounds > [-Warray-bounds] > oea->fixed[i] = oea->fixed[i+1]; > ^ Strange. I do not think that loop/logic was changed/impacted by 15036. Did the warning appear specifically with this revision ? What is the gcc version/platform ? I tried on a recent platform (gcc 4.9.2, Fedora 21, s390) after having added -Warray-bounds but no warning obtained. This looks however a false positive to me: n_fixed is the nr of elements initialised in the array. So, 0 .. n_fixed-1 can be used And the condition to stop the loop is i+1 < n_fixed. So, it looks to me that fixed[i+1] will be ok. It is also unclear how gcc can guess the relationship between n_fixed and the array bounds, unless it has understood the logic in OutEdgeArr__add. Philippe |
|
From: <sv...@va...> - 2015-03-24 14:02:52
|
Author: philippe
Date: Tue Mar 24 14:02:44 2015
New Revision: 15037
Log:
* Add in helgrind stats the nr of live/exit/joined/exit and joined threads
* avoid division by 0 in m_transtab.c stats before anything was done
Modified:
trunk/coregrind/m_transtab.c
trunk/helgrind/libhb_core.c
Modified: trunk/coregrind/m_transtab.c
==============================================================================
--- trunk/coregrind/m_transtab.c (original)
+++ trunk/coregrind/m_transtab.c Tue Mar 24 14:02:44 2015
@@ -2410,7 +2410,7 @@
n_in_count, n_in_osize, n_in_tsize,
safe_idiv(10*n_in_tsize, n_in_osize),
n_in_sc_count,
- (int) (n_in_tsize / n_in_count));
+ (int) (n_in_tsize / (n_in_count ? n_in_count : 1)));
VG_(message)(Vg_DebugMsg,
" transtab: dumped %'llu (%'llu -> ?" "?) "
"(sectors recycled %'llu)\n",
Modified: trunk/helgrind/libhb_core.c
==============================================================================
--- trunk/helgrind/libhb_core.c (original)
+++ trunk/helgrind/libhb_core.c Tue Mar 24 14:02:44 2015
@@ -6232,6 +6232,34 @@
VG_(sizeFM)( vts_set ) );
VG_(printf)("%s","\n");
+ {
+ UInt live = 0;
+ UInt llexit_done = 0;
+ UInt joinedwith_done = 0;
+ UInt llexit_and_joinedwith_done = 0;
+
+ Thread* hgthread = get_admin_threads();
+ tl_assert(hgthread);
+ while (hgthread) {
+ Thr* hbthr = hgthread->hbthr;
+ tl_assert(hbthr);
+ if (hbthr->llexit_done && hbthr->joinedwith_done)
+ llexit_and_joinedwith_done++;
+ else if (hbthr->llexit_done)
+ llexit_done++;
+ else if (hbthr->joinedwith_done)
+ joinedwith_done++;
+ else
+ live++;
+ hgthread = hgthread->admin;
+ }
+ VG_(printf)(" libhb: threads live: %d exit_and_joinedwith %d"
+ " exit %d joinedwith %d\n",
+ live, llexit_and_joinedwith_done,
+ llexit_done, joinedwith_done);
+ }
+
+ VG_(printf)("%s","\n");
VG_(printf)( " libhb: ctxt__rcdec: 1=%lu(%lu eq), 2=%lu, 3=%lu\n",
stats__ctxt_rcdec1, stats__ctxt_rcdec1_eq,
stats__ctxt_rcdec2,
|
|
From: Florian K. <fl...@ei...> - 2015-03-24 13:25:55
|
On 23.03.2015 22:49, sv...@va... wrote:
> Author: philippe
> Date: Mon Mar 23 21:49:32 2015
> New Revision: 15036
>
I'm seeing:
m_transtab.c: In function 'unchain_in_preparation_for_deletion':
m_transtab.c:619:36: warning: array subscript is above array bounds
[-Warray-bounds]
oea->fixed[i] = oea->fixed[i+1];
^
Florian
|