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glib/gobject/tests/reference.c
Philip Withnall d951db4236 gobject: Add g_set_object() convenience function to set GObject pointers 
Along the same lines as g_clear_object(), g_set_object() is a
convenience function to update a GObject pointer, handling reference
counting transparently and correctly.

Specifically, it handles the case where a pointer is set to its current
value. If handled naïvely, that could result in the object instance
being finalised. In the following code, that happens when
(my_obj == new_value) and the object has a single reference:
    g_clear_object (&my_obj);
    my_obj = g_object_ref (new_value);

It also simplifies boilerplate code such as set_property()
implementations, which are otherwise long and boring.

Test cases included.

https://bugzilla.gnome.org/show_bug.cgi?id=741589
2014-12-18 11:32:56 +00:00

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#include <glib-object.h>
static void
test_fundamentals (void)
{
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_NONE));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_INTERFACE));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_CHAR));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_UCHAR));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_BOOLEAN));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_INT));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_UINT));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_LONG));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_ULONG));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_INT64));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_UINT64));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_ENUM));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_FLAGS));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_FLOAT));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_DOUBLE));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_STRING));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_POINTER));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_BOXED));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_PARAM));
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_OBJECT));
g_assert (G_TYPE_OBJECT == g_object_get_type ());
g_assert (G_TYPE_IS_FUNDAMENTAL (G_TYPE_VARIANT));
g_assert (G_TYPE_IS_DERIVED (G_TYPE_INITIALLY_UNOWNED));
g_assert (g_type_fundamental_next () == G_TYPE_MAKE_FUNDAMENTAL (G_TYPE_RESERVED_USER_FIRST));
}
static void
test_type_qdata (void)
{
gchar *data;
g_type_set_qdata (G_TYPE_ENUM, g_quark_from_string ("bla"), "bla");
data = g_type_get_qdata (G_TYPE_ENUM, g_quark_from_string ("bla"));
g_assert_cmpstr (data, ==, "bla");
}
static void
test_type_query (void)
{
GTypeQuery query;
g_type_query (G_TYPE_ENUM, &query);
g_assert_cmpint (query.type, ==, G_TYPE_ENUM);
g_assert_cmpstr (query.type_name, ==, "GEnum");
g_assert_cmpint (query.class_size, ==, sizeof (GEnumClass));
g_assert_cmpint (query.instance_size, ==, 0);
}
typedef struct _MyObject MyObject;
typedef struct _MyObjectClass MyObjectClass;
typedef struct _MyObjectClassPrivate MyObjectClassPrivate;
struct _MyObject
{
GObject parent_instance;
gint count;
};
struct _MyObjectClass
{
GObjectClass parent_class;
};
struct _MyObjectClassPrivate
{
gint secret_class_count;
};
static GType my_object_get_type (void);
G_DEFINE_TYPE_WITH_CODE (MyObject, my_object, G_TYPE_OBJECT,
g_type_add_class_private (g_define_type_id, sizeof (MyObjectClassPrivate)) );
static void
my_object_init (MyObject *obj)
{
obj->count = 42;
}
static void
my_object_class_init (MyObjectClass *klass)
{
}
static void
test_class_private (void)
{
GObject *obj;
MyObjectClass *class;
MyObjectClassPrivate *priv;
obj = g_object_new (my_object_get_type (), NULL);
class = g_type_class_ref (my_object_get_type ());
priv = G_TYPE_CLASS_GET_PRIVATE (class, my_object_get_type (), MyObjectClassPrivate);
priv->secret_class_count = 13;
g_type_class_unref (class);
g_object_unref (obj);
g_assert_cmpint (g_type_qname (my_object_get_type ()), ==, g_quark_from_string ("MyObject"));
}
static void
test_clear (void)
{
GObject *o = NULL;
GObject *tmp;
g_clear_object (&o);
g_assert (o == NULL);
tmp = g_object_new (G_TYPE_OBJECT, NULL);
g_assert_cmpint (tmp->ref_count, ==, 1);
o = g_object_ref (tmp);
g_assert (o != NULL);
g_assert_cmpint (tmp->ref_count, ==, 2);
g_clear_object (&o);
g_assert_cmpint (tmp->ref_count, ==, 1);
g_assert (o == NULL);
g_object_unref (tmp);
}
static void
test_clear_function (void)
{
volatile GObject *o = NULL;
GObject *tmp;
(g_clear_object) (&o);
g_assert (o == NULL);
tmp = g_object_new (G_TYPE_OBJECT, NULL);
g_assert_cmpint (tmp->ref_count, ==, 1);
o = g_object_ref (tmp);
g_assert (o != NULL);
g_assert_cmpint (tmp->ref_count, ==, 2);
(g_clear_object) (&o);
g_assert_cmpint (tmp->ref_count, ==, 1);
g_assert (o == NULL);
g_object_unref (tmp);
}
static void
test_set (void)
{
GObject *o = NULL;
GObject *tmp;
g_assert (!g_set_object (&o, NULL));
g_assert (o == NULL);
tmp = g_object_new (G_TYPE_OBJECT, NULL);
g_assert_cmpint (tmp->ref_count, ==, 1);
g_assert (g_set_object (&o, tmp));
g_assert (o == tmp);
g_assert_cmpint (tmp->ref_count, ==, 2);
g_object_unref (tmp);
g_assert_cmpint (tmp->ref_count, ==, 1);
/* Setting it again shouldn’t cause finalisation. */
g_assert (!g_set_object (&o, tmp));
g_assert (o == tmp);
g_assert_cmpint (tmp->ref_count, ==, 1);
g_assert (g_set_object (&o, NULL));
g_assert (o == NULL);
g_assert (!G_IS_OBJECT (tmp)); /* finalised */
}
static void
test_set_function (void)
{
GObject *o = NULL;
GObject *tmp;
g_assert (!(g_set_object) (&o, NULL));
g_assert (o == NULL);
tmp = g_object_new (G_TYPE_OBJECT, NULL);
g_assert_cmpint (tmp->ref_count, ==, 1);
g_assert ((g_set_object) (&o, tmp));
g_assert (o == tmp);
g_assert_cmpint (tmp->ref_count, ==, 2);
g_object_unref (tmp);
g_assert_cmpint (tmp->ref_count, ==, 1);
/* Setting it again shouldn’t cause finalisation. */
g_assert (!(g_set_object) (&o, tmp));
g_assert (o == tmp);
g_assert_cmpint (tmp->ref_count, ==, 1);
g_assert ((g_set_object) (&o, NULL));
g_assert (o == NULL);
g_assert (!G_IS_OBJECT (tmp)); /* finalised */
}
static void
toggle_cb (gpointer data, GObject *obj, gboolean is_last)
{
gboolean *b = data;
*b = TRUE;
}
static void
test_object_value (void)
{
GObject *v;
GObject *v2;
GValue value = G_VALUE_INIT;
gboolean toggled = FALSE;
g_value_init (&value, G_TYPE_OBJECT);
v = g_object_new (G_TYPE_OBJECT, NULL);
g_object_add_toggle_ref (v, toggle_cb, &toggled);
g_value_take_object (&value, v);
v2 = g_value_get_object (&value);
g_assert (v2 == v);
v2 = g_value_dup_object (&value);
g_assert (v2 == v); /* objects use ref/unref for copy/free */
g_object_unref (v2);
g_assert (!toggled);
g_value_unset (&value);
g_assert (toggled);
/* test the deprecated variant too */
g_value_init (&value, G_TYPE_OBJECT);
/* get a new reference */
g_object_ref (v);
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
g_value_set_object_take_ownership (&value, v);
G_GNUC_END_IGNORE_DEPRECATIONS
toggled = FALSE;
g_value_unset (&value);
g_assert (toggled);
g_object_remove_toggle_ref (v, toggle_cb, &toggled);
}
static void
test_initially_unowned (void)
{
GObject *obj;
obj = g_object_new (G_TYPE_INITIALLY_UNOWNED, NULL);
g_assert (g_object_is_floating (obj));
g_assert_cmpint (obj->ref_count, ==, 1);
g_object_ref_sink (obj);
g_assert (!g_object_is_floating (obj));
g_assert_cmpint (obj->ref_count, ==, 1);
g_object_ref_sink (obj);
g_assert (!g_object_is_floating (obj));
g_assert_cmpint (obj->ref_count, ==, 2);
g_object_unref (obj);
g_assert_cmpint (obj->ref_count, ==, 1);
g_object_force_floating (obj);
g_assert (g_object_is_floating (obj));
g_assert_cmpint (obj->ref_count, ==, 1);
g_object_ref_sink (obj);
g_object_unref (obj);
}
static void
test_weak_pointer (void)
{
GObject *obj;
gpointer weak;
gpointer weak2;
weak = weak2 = obj = g_object_new (G_TYPE_OBJECT, NULL);
g_assert_cmpint (obj->ref_count, ==, 1);
g_object_add_weak_pointer (obj, &weak);
g_object_add_weak_pointer (obj, &weak2);
g_assert_cmpint (obj->ref_count, ==, 1);
g_assert (weak == obj);
g_assert (weak2 == obj);
g_object_remove_weak_pointer (obj, &weak2);
g_assert_cmpint (obj->ref_count, ==, 1);
g_assert (weak == obj);
g_assert (weak2 == obj);
g_object_unref (obj);
g_assert (weak == NULL);
g_assert (weak2 == obj);
}
/* See gobject/tests/threadtests.c for the threaded version */
static void
test_weak_ref (void)
{
GObject *obj;
GObject *obj2;
GObject *tmp;
GWeakRef weak = { { GUINT_TO_POINTER (0xDEADBEEFU) } };
GWeakRef weak2 = { { GUINT_TO_POINTER (0xDEADBEEFU) } };
GWeakRef weak3 = { { GUINT_TO_POINTER (0xDEADBEEFU) } };
GWeakRef *dynamic_weak = g_new (GWeakRef, 1);
/* you can initialize to empty like this... */
g_weak_ref_init (&weak2, NULL);
g_assert (g_weak_ref_get (&weak2) == NULL);
/* ... or via an initializer */
g_weak_ref_init (&weak3, NULL);
g_assert (g_weak_ref_get (&weak3) == NULL);
obj = g_object_new (G_TYPE_OBJECT, NULL);
g_assert_cmpint (obj->ref_count, ==, 1);
obj2 = g_object_new (G_TYPE_OBJECT, NULL);
g_assert_cmpint (obj2->ref_count, ==, 1);
/* you can init with an object (even if uninitialized) */
g_weak_ref_init (&weak, obj);
g_weak_ref_init (dynamic_weak, obj);
/* or set to point at an object, if initialized (maybe to 0) */
g_weak_ref_set (&weak2, obj);
g_weak_ref_set (&weak3, obj);
/* none of this affects its refcount */
g_assert_cmpint (obj->ref_count, ==, 1);
/* getting the value takes a ref */
tmp = g_weak_ref_get (&weak);
g_assert (tmp == obj);
g_assert_cmpint (obj->ref_count, ==, 2);
g_object_unref (tmp);
g_assert_cmpint (obj->ref_count, ==, 1);
tmp = g_weak_ref_get (&weak2);
g_assert (tmp == obj);
g_assert_cmpint (obj->ref_count, ==, 2);
g_object_unref (tmp);
g_assert_cmpint (obj->ref_count, ==, 1);
tmp = g_weak_ref_get (&weak3);
g_assert (tmp == obj);
g_assert_cmpint (obj->ref_count, ==, 2);
g_object_unref (tmp);
g_assert_cmpint (obj->ref_count, ==, 1);
tmp = g_weak_ref_get (dynamic_weak);
g_assert (tmp == obj);
g_assert_cmpint (obj->ref_count, ==, 2);
g_object_unref (tmp);
g_assert_cmpint (obj->ref_count, ==, 1);
/* clearing a weak ref stops tracking */
g_weak_ref_clear (&weak);
/* setting a weak ref to NULL stops tracking too */
g_weak_ref_set (&weak2, NULL);
g_assert (g_weak_ref_get (&weak2) == NULL);
g_weak_ref_clear (&weak2);
/* setting a weak ref to a new object stops tracking the old one */
g_weak_ref_set (dynamic_weak, obj2);
tmp = g_weak_ref_get (dynamic_weak);
g_assert (tmp == obj2);
g_assert_cmpint (obj2->ref_count, ==, 2);
g_object_unref (tmp);
g_assert_cmpint (obj2->ref_count, ==, 1);
g_assert_cmpint (obj->ref_count, ==, 1);
/* free the object: weak3 is the only one left pointing there */
g_object_unref (obj);
g_assert (g_weak_ref_get (&weak3) == NULL);
/* setting a weak ref to a new object stops tracking the old one */
g_weak_ref_set (dynamic_weak, obj2);
tmp = g_weak_ref_get (dynamic_weak);
g_assert (tmp == obj2);
g_assert_cmpint (obj2->ref_count, ==, 2);
g_object_unref (tmp);
g_assert_cmpint (obj2->ref_count, ==, 1);
g_weak_ref_clear (&weak3);
/* clear and free dynamic_weak... */
g_weak_ref_clear (dynamic_weak);
/* ... to prove that doing so stops this from being a use-after-free */
g_object_unref (obj2);
g_free (dynamic_weak);
}
typedef struct
{
gboolean should_be_last;
gint count;
} Count;
static void
toggle_notify (gpointer data,
GObject *obj,
gboolean is_last)
{
Count *c = data;
g_assert (is_last == c->should_be_last);
c->count++;
}
static void
test_toggle_ref (void)
{
GObject *obj;
Count c, c2;
obj = g_object_new (G_TYPE_OBJECT, NULL);
g_object_add_toggle_ref (obj, toggle_notify, &c);
g_object_add_toggle_ref (obj, toggle_notify, &c2);
c.should_be_last = c2.should_be_last = TRUE;
c.count = c2.count = 0;
g_object_unref (obj);
g_assert_cmpint (c.count, ==, 0);
g_assert_cmpint (c2.count, ==, 0);
g_object_ref (obj);
g_assert_cmpint (c.count, ==, 0);
g_assert_cmpint (c2.count, ==, 0);
g_object_remove_toggle_ref (obj, toggle_notify, &c2);
g_object_unref (obj);
g_assert_cmpint (c.count, ==, 1);
c.should_be_last = FALSE;
g_object_ref (obj);
g_assert_cmpint (c.count, ==, 2);
c.should_be_last = TRUE;
g_object_unref (obj);
g_assert_cmpint (c.count, ==, 3);
g_object_remove_toggle_ref (obj, toggle_notify, &c);
}
static gboolean destroyed;
static gint value;
static void
data_destroy (gpointer data)
{
g_assert_cmpint (GPOINTER_TO_INT (data), ==, value);
destroyed = TRUE;
}
static void
test_object_qdata (void)
{
GObject *obj;
gpointer v;
GQuark quark;
obj = g_object_new (G_TYPE_OBJECT, NULL);
value = 1;
destroyed = FALSE;
g_object_set_data_full (obj, "test", GINT_TO_POINTER (1), data_destroy);
v = g_object_get_data (obj, "test");
g_assert_cmpint (GPOINTER_TO_INT (v), ==, 1);
g_object_set_data_full (obj, "test", GINT_TO_POINTER (2), data_destroy);
g_assert (destroyed);
value = 2;
destroyed = FALSE;
v = g_object_steal_data (obj, "test");
g_assert_cmpint (GPOINTER_TO_INT (v), ==, 2);
g_assert (!destroyed);
value = 1;
destroyed = FALSE;
quark = g_quark_from_string ("test");
g_object_set_qdata_full (obj, quark, GINT_TO_POINTER (1), data_destroy);
v = g_object_get_qdata (obj, quark);
g_assert_cmpint (GPOINTER_TO_INT (v), ==, 1);
g_object_set_qdata_full (obj, quark, GINT_TO_POINTER (2), data_destroy);
g_assert (destroyed);
value = 2;
destroyed = FALSE;
v = g_object_steal_qdata (obj, quark);
g_assert_cmpint (GPOINTER_TO_INT (v), ==, 2);
g_assert (!destroyed);
g_object_set_qdata_full (obj, quark, GINT_TO_POINTER (3), data_destroy);
value = 3;
destroyed = FALSE;
g_object_unref (obj);
g_assert (destroyed);
}
typedef struct {
const gchar *value;
gint refcount;
} Value;
static gpointer
ref_value (gpointer value, gpointer user_data)
{
Value *v = value;
Value **old_value_p = user_data;
if (old_value_p)
*old_value_p = v;
if (v)
v->refcount += 1;
return value;
}
static void
unref_value (gpointer value)
{
Value *v = value;
v->refcount -= 1;
if (v->refcount == 0)
g_free (value);
}
static
Value *
new_value (const gchar *s)
{
Value *v;
v = g_new (Value, 1);
v->value = s;
v->refcount = 1;
return v;
}
static void
test_object_qdata2 (void)
{
GObject *obj;
Value *v, *v1, *v2, *v3, *old_val;
GDestroyNotify old_destroy;
gboolean res;
obj = g_object_new (G_TYPE_OBJECT, NULL);
v1 = new_value ("bla");
g_object_set_data_full (obj, "test", v1, unref_value);
v = g_object_get_data (obj, "test");
g_assert_cmpstr (v->value, ==, "bla");
g_assert_cmpint (v->refcount, ==, 1);
v = g_object_dup_data (obj, "test", ref_value, &old_val);
g_assert (old_val == v1);
g_assert_cmpstr (v->value, ==, "bla");
g_assert_cmpint (v->refcount, ==, 2);
unref_value (v);
v = g_object_dup_data (obj, "nono", ref_value, &old_val);
g_assert (old_val == NULL);
g_assert (v == NULL);
v2 = new_value ("not");
res = g_object_replace_data (obj, "test", v1, v2, unref_value, &old_destroy);
g_assert (res == TRUE);
g_assert (old_destroy == unref_value);
g_assert_cmpstr (v1->value, ==, "bla");
g_assert_cmpint (v1->refcount, ==, 1);
v = g_object_get_data (obj, "test");
g_assert_cmpstr (v->value, ==, "not");
g_assert_cmpint (v->refcount, ==, 1);
v3 = new_value ("xyz");
res = g_object_replace_data (obj, "test", v1, v3, unref_value, &old_destroy);
g_assert (res == FALSE);
g_assert_cmpstr (v2->value, ==, "not");
g_assert_cmpint (v2->refcount, ==, 1);
unref_value (v1);
res = g_object_replace_data (obj, "test", NULL, v3, unref_value, &old_destroy);
g_assert (res == FALSE);
g_assert_cmpstr (v2->value, ==, "not");
g_assert_cmpint (v2->refcount, ==, 1);
res = g_object_replace_data (obj, "test", v2, NULL, unref_value, &old_destroy);
g_assert (res == TRUE);
g_assert (old_destroy == unref_value);
g_assert_cmpstr (v2->value, ==, "not");
g_assert_cmpint (v2->refcount, ==, 1);
unref_value (v2);
v = g_object_get_data (obj, "test");
g_assert (v == NULL);
res = g_object_replace_data (obj, "test", NULL, v3, unref_value, &old_destroy);
g_assert (res == TRUE);
v = g_object_get_data (obj, "test");
g_assert (v == v3);
ref_value (v3, NULL);
g_assert_cmpint (v3->refcount, ==, 2);
g_object_unref (obj);
g_assert_cmpint (v3->refcount, ==, 1);
unref_value (v3);
}
int
main (int argc, char **argv)
{
g_test_init (&argc, &argv, NULL);
g_test_add_func ("/type/fundamentals", test_fundamentals);
g_test_add_func ("/type/qdata", test_type_qdata);
g_test_add_func ("/type/query", test_type_query);
g_test_add_func ("/type/class-private", test_class_private);
g_test_add_func ("/object/clear", test_clear);
g_test_add_func ("/object/clear-function", test_clear_function);
g_test_add_func ("/object/set", test_set);
g_test_add_func ("/object/set-function", test_set_function);
g_test_add_func ("/object/value", test_object_value);
g_test_add_func ("/object/initially-unowned", test_initially_unowned);
g_test_add_func ("/object/weak-pointer", test_weak_pointer);
g_test_add_func ("/object/weak-ref", test_weak_ref);
g_test_add_func ("/object/toggle-ref", test_toggle_ref);
g_test_add_func ("/object/qdata", test_object_qdata);
g_test_add_func ("/object/qdata2", test_object_qdata2);
return g_test_run ();
}
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