Glib 1.102 (stable)

On Thu, Dec 15, 2005 at 10:44:42AM -0500, Sean Dague wrote:
<snip>
> > This looks like you have a perl-derived
CellRenderer in your code.   
> > In frame #5,
gtk_tree_view_column_cell_set_cell_data() is calling  
> > g_object_set_property() on something, most likely
using an attribute  
> > set up when the TreeViewColumn was created.
> > 
> > The first red flag is the value of property_name
in frame #4 -- is  
> > that a garbage string or a unicode string?  I
believe that most of  
> > the code assumes property names will be ASCII. 
This questionable  
> > value appears to have been mapped to a decent
property id for the  
> > call to gperl_type_set_property(), which is in the
vtable for perl- 
> > derived GObjects.  When gperl_type_set_property()
discovers there is  
> > no SET_PROPERTY() in the package and no sub
registered as a set  
> > handler, it falls back to setting a key in the
wrapper hash with the  
> > same name as the property.  However, as you see in
the trace, the  
> > name in frame #2 does not match the property_name
in frame #4.

The following program was provided by one of our users that
demonstrates the
glib crash we're seeing.  Hopefully this will help figure
out if there is a
bug in glib, or a bug in our brains, and we should be doing
something
different.

#!/usr/bin/perl -w

# With Glib Perl v1.101 this script does not crash, but with
v1.102
# it does.  Removing the lines with BUG fixes the problem. 
Sadly
# fixing it tends to be more difficult in practice.
#
# On 1.102 I get:
#
#   bash$ perl crash.pl 
#   INIT_INSTANCE
#   Segmentation fault (core dumped)
#   bash$ fgrep -v BUG crash.pl >work.pl 
#   bash$ perl work.pl  
#   INIT_INSTANCE
#   Success made it to GET_SIZE
#

package CrashTest::CellRenderer;
use strict;
use Glib qw(G_PARAM_READWRITE);
use Gtk2;
use Glib::Object::Subclass "Gtk2::CellRenderer",
  properties => [ Glib::ParamSpec->string('text',
'Text',
					  'The text string to display', '',
					  G_PARAM_READWRITE) ];

sub INIT_INSTANCE { warn "INIT_INSTANCEn"; }
sub GET_SIZE { die "Made it to GET_SIZEn"; }
sub RENDER { die "Made it to RENDERn"; }

package main;
use strict;
use Glib;
use Gtk2 -init;

my $window = Gtk2::Window->new;
my $view;
{ # BUG: remove these brackets and it works!
  my $treestore = Gtk2::TreeStore->new(qw/Glib::String/);
  my $iter = $treestore->append(undef);
  $treestore->set($iter, 0, "Row 1",);
  $view = Gtk2::TreeView->new($treestore);
  my $renderer = CrashTest::CellRenderer->new;
  my $col =

Gtk2::TreeViewColumn->new_with_attributes("Simple
text",
                                              $renderer,

"text" => 0);
  $view->append_column($col);
} # BUG: remove these brackets and it works!
$window->add ($view);
$window->show_all;
Gtk2->main;

-- 
____________________________________________________________
______

Sean Dague                                       Mid-Hudson
Valley
sean at dague dot net                            Linux Users
Group
http://dague.net             
                   http://mhvlug.org

There is no silver bullet.  Plus, werewolves make better
neighbors
than zombies, and they tend to keep the vampire population
down.
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Glib 1.102 (stable)

Thread: Glib 1.102 (stable)