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Add simple instance count facility

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Add GOBJECT_DEBUG=instance-count which enables internal accounting
of the number of instances of each GType, and g_type_get_instance_count()
to retrieve the result.

https://bugzilla.gnome.org/show_bug.cgi?id=354457
This commit is contained in:
Owen W. Taylor 2014-10-09 16:38:10 -04:00 committed by Matthias Clasen
parent aa401aef87
commit 011bf876e7
2 changed files with 55 additions and 2 deletions
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51
gobject/gtype.c
View File

@ -33,6 +33,9 @@
#include "gconstructor.h"
#ifdef G_ENABLE_DEBUG
#define IF_DEBUG(debug_type) if (_g_type_debug_flags & G_TYPE_DEBUG_ ## debug_type)
#endif
/**
* SECTION:gtype
@ -223,6 +226,9 @@ typedef enum
struct _TypeNode
{
guint volatile ref_count;
#ifdef G_ENABLE_DEBUG
guint volatile instance_count;
#endif
GTypePlugin *plugin;
guint n_children; /* writable with lock */
guint n_supers : 8;
@ -506,7 +512,6 @@ type_node_any_new_W (TypeNode *pnode,
node->data = NULL;
node->qname = g_quark_from_string (name);
node->global_gdata = NULL;
g_hash_table_insert (static_type_nodes_ht,
(gpointer) g_quark_to_string (node->qname),
(gpointer) type);
@ -1864,6 +1869,13 @@ g_type_create_instance (GType type)
if (node->data->instance.instance_init)
node->data->instance.instance_init (instance, class);
#ifdef G_ENABLE_DEBUG
IF_DEBUG (INSTANCE_COUNT)
{
g_atomic_int_inc ((int *) &node->instance_count);
}
#endif
TRACE(GOBJECT_OBJECT_NEW(instance, type));
return instance;
@ -1934,6 +1946,13 @@ g_type_free_instance (GTypeInstance *instance)
else
g_slice_free1 (private_size + ivar_size, allocated);
#ifdef G_ENABLE_DEBUG
IF_DEBUG (INSTANCE_COUNT)
{
g_atomic_int_add ((int *) &node->instance_count, -1);
}
#endif
g_type_class_unref (class);
}
@ -3807,6 +3826,34 @@ g_type_query (GType type,
}
}
/**
* g_type_get_instance_count:
* @type: a #GType
*
* Returns the number of instances allocated of the particular type;
* this is only available if GLib is built with debugging support and
* the instance_count debug flag is set (by setting the GOBJECT_DEBUG
* variable to include instance-count).
*
* Returns: the number of instances allocated of the given type;
* if instance counts are not available, returns 0.
*
* Since: 2.44
*/
int
g_type_get_instance_count (GType type)
{
#ifdef G_ENABLE_DEBUG
TypeNode *node;
node = lookup_type_node_I (type);
g_return_if_fail (node != NULL);
return g_atomic_int_get (&node->instance_count);
#else
return 0;
#endif
}
/* --- implementation details --- */
gboolean
@ -4337,6 +4384,7 @@ gobject_init_ctor (void)
{
GDebugKey debug_keys[] = {
{ "objects", G_TYPE_DEBUG_OBJECTS },
{ "instance-count", G_TYPE_DEBUG_INSTANCE_COUNT },
{ "signals", G_TYPE_DEBUG_SIGNALS },
};
@ -4817,3 +4865,4 @@ g_type_ensure (GType type)
if (G_UNLIKELY (type == (GType)-1))
g_error ("can't happen");
}

6
gobject/gtype.h
View File

@ -656,6 +656,7 @@ struct _GTypeQuery
* @G_TYPE_DEBUG_OBJECTS: Print messages about object bookkeeping
* @G_TYPE_DEBUG_SIGNALS: Print messages about signal emissions
* @G_TYPE_DEBUG_MASK: Mask covering all debug flags
* @G_TYPE_DEBUG_INSTANCE_COUNT: Keep a count of instances of each type
*
* These flags used to be passed to g_type_init_with_debug_flags() which
* is now deprecated.
@ -670,7 +671,8 @@ typedef enum /*< skip >*/
G_TYPE_DEBUG_NONE = 0,
G_TYPE_DEBUG_OBJECTS = 1 << 0,
G_TYPE_DEBUG_SIGNALS = 1 << 1,
G_TYPE_DEBUG_MASK = 0x03
G_TYPE_DEBUG_INSTANCE_COUNT = 1 << 2,
G_TYPE_DEBUG_MASK = 0x07
} GTypeDebugFlags;
@ -738,6 +740,8 @@ GLIB_AVAILABLE_IN_ALL
void g_type_query (GType type,
GTypeQuery *query);
GLIB_AVAILABLE_IN_2_44
int g_type_get_instance_count (GType type);
/* --- type registration --- */
/**