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Drop g_trap_object_ref debugging mechanism

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This is really just a very crude and limited conditional breakpoint.
Update the documentation to explain conditional breakpoints in
gdb instead. Also, remove the link to refdbg, which appears dead.

https://bugzilla.gnome.org/show_bug.cgi?id=719687
This commit is contained in:
Matthias Clasen 2013-12-02 21:48:03 -05:00
parent 0f800cd1a8
commit 28c2706da7
2 changed files with 7 additions and 26 deletions
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21
docs/reference/gobject/tut_tools.xml
View File

@ -73,24 +73,17 @@
The reference counting scheme used by GObject does solve quite
a few memory management problems but also introduces new sources of bugs.
In large applications, finding the exact spot where the reference count
of an Object is not properly handled can be very difficult. Hopefully,
there exist a tool named <ulink url="http://refdbg.sf.net/">refdbg</ulink>
which can be used to automate the task of tracking down the location
of invalid code with regard to reference counting. This application
intercepts the reference counting calls and tries to detect invalid behavior.
It supports a filter-rule mechanism to let you trace only the objects you are
interested in and it can be used together with GDB.
of an Object is not properly handled can be very difficult.
</para>
<para>
<indexterm><primary>g_trap_object_ref</primary></indexterm>
Note that if GObject has been compiled with <option>--enable-debug=yes</option>,
it exports a trap variable
A useful tool in debugging reference counting problems is to
set breakpoints in gdb on g_object_ref() and g_object_unref().
Once you know the address of the object you are interested in,
you can make the breakpoints conditional:
<programlisting>
static volatile GObject *g_trap_object_ref;
break g_object_ref if _object == 0xcafebabe
break g_object_unref if _object == 0xcafebabe
</programlisting>
If set to a non-NULL value, <link linkend="g-object-ref">g_object_ref</link>()
and <link linkend="g-object-unref">g_object_unref</link>() will be intercepted
when called with that value.
</para>
</chapter>

12
gobject/gobject.c
View File

@ -313,7 +313,6 @@ g_object_notify_queue_add (GObject *object,
#ifdef G_ENABLE_DEBUG
#define IF_DEBUG(debug_type) if (_g_type_debug_flags & G_TYPE_DEBUG_ ## debug_type)
G_LOCK_DEFINE_STATIC (debug_objects);
static volatile GObject *g_trap_object_ref = NULL;
static guint debug_objects_count = 0;
static GHashTable *debug_objects_ht = NULL;
@ -3043,12 +3042,6 @@ g_object_ref (gpointer _object)
g_return_val_if_fail (G_IS_OBJECT (object), NULL);
g_return_val_if_fail (object->ref_count > 0, NULL);
#ifdef G_ENABLE_DEBUG
if (g_trap_object_ref == object)
G_BREAKPOINT ();
#endif /* G_ENABLE_DEBUG */
old_val = g_atomic_int_add (&object->ref_count, 1);
if (old_val == 1 && OBJECT_HAS_TOGGLE_REF (object))
@ -3075,11 +3068,6 @@ g_object_unref (gpointer _object)
g_return_if_fail (G_IS_OBJECT (object));
g_return_if_fail (object->ref_count > 0);
#ifdef G_ENABLE_DEBUG
if (g_trap_object_ref == object)
G_BREAKPOINT ();
#endif /* G_ENABLE_DEBUG */
/* here we want to atomically do: if (ref_count>1) { ref_count--; return; } */
retry_atomic_decrement1:
old_ref = g_atomic_int_get (&object->ref_count);