[Bug c/37154] New: static inline function problem

[wrobell at pld-linux dot org]

i am getting SIGSEGV while starting two glib2 applications.
please take a look at glib2/gogject/gsignal.c code:

-
2280  gboolean continue_emission;
2281
2282  if (!accumulator)
2283return TRUE;
2284
2285  continue_emission = accumulator->func (ihint, return_accu,
handler_return, accumulator->data);
2286  g_value_reset (handler_return);
--

gdb claims that problem is at line 2285, variable "accumulator" is 0x0,
which should not happen due to lines 228{2,3}.

the function is declared as 'static inline'. removing inline keyword and
recompilation helps. commmand used to compile gsignal.c file:


ppc-pld-linux-gcc -DHAVE_CONFIG_H -I. -I.. -DG_LOG_DOMAIN=\"GLib-GObject\" -I..
-I../glib -I.. -DG_DISABLE_CAST_CHECKS -DG_DISABLE_DEPRECATED
-DGOBJECT_COMPILATION -DG_DISABLE_CONST_RETURNS -D_FORTIFY_SOURCE=2 -pthread
-O2 -fno-strict-aliasing -fwrapv -fsigned-char -gdwarf-2 -g2 -Wall -MT
gsignal.lo -MD -MP -MF .deps/gsignal.Tpo -c gsignal.c  -fPIC -DPIC -o
.libs/gsignal.o
-


-- 
   Summary: static inline function problem
   Product: gcc
   Version: 4.3.1
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c
AssignedTo: unassigned at gcc dot gnu dot org
    ReportedBy: wrobell at pld-linux dot org
 GCC build triplet: ppc-pld-linux-gcc
  GCC host triplet: ppc-pld-linux-gcc
GCC target triplet: ppc-pld-linux-gcc


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37154

[Bug c/37154] static inline function problem

[wrobell at pld-linux dot org]

--- Comment #1 from wrobell at pld-linux dot org  2008-08-18 21:05 ---
Created an attachment (id=16088)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=16088&action=view)
gsignal.i file


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37154

[Bug c/37154] static inline function problem

[wrobell at pld-linux dot org]

--- Comment #2 from wrobell at pld-linux dot org  2008-08-18 21:05 ---
Created an attachment (id=16089)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=16089&action=view)
gsignal.s file created by gcc before 'inline' keyword removal


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37154

[Bug c/37154] static inline function problem

[wrobell at pld-linux dot org]

--- Comment #3 from wrobell at pld-linux dot org  2008-08-18 21:06 ---
Created an attachment (id=16090)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=16090&action=view)
gsignal.s file after 'inline' keyword removal


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37154

[Bug middle-end/37154] static inline function problem

[wrobell at pld-linux dot org]

--- Comment #5 from wrobell at pld-linux dot org  2008-08-18 22:40 ---
(In reply to comment #4)
> >gdb claims that problem is at line 2285, variable "accumulator" is 0x0,
> 
> well with optimization, debugging info is not always fully correct.
> 

i've changed function declaration again to 'static inline'
and inserted

printf('acc %d\n', accumulator);

just before line 2285.

i've got 'acc 0'. so it is really 0x0 and the condition at line 2282
is not evaluated properly (or was optimized out/whatever :)


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37154