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GObject: change the order of property checks

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Change the order of the checks so that we hear about the 'biggest'
problem first.  Also, stop reporting problems after we report the first
one for a particular property.

Add some comments.

https://bugzilla.gnome.org/show_bug.cgi?id=666616
This commit is contained in:
Ryan Lortie 2011-12-20 18:41:03 -05:00
parent 5fb7a8e127
commit d8d78688a8
1 changed files with 50 additions and 20 deletions
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70
gobject/gobject.c
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@ -1373,6 +1373,56 @@ object_interface_check_properties (gpointer func_data,
continue; continue;
} }
/* We do a number of checks on the properties of an interface to
* make sure that all classes implementing the interface are
* overriding the properties in a sane way.
*
* We do the checks in order of importance so that we can give
* more useful error messages first.
*
* First, we check that the implementation doesn't remove the
* basic functionality (readability, writability) advertised by
* the interface. Next, we check that it doesn't introduce
* additional restrictions (such as construct-only). Finally, we
* make sure the types are compatible.
*/
#define SUBSET(a,b,mask) (((a) & ~(b) & (mask)) == 0)
/* If the property on the interface is readable then the
* implementation must be readable. If the interface is writable
* then the implementation must be writable.
*/
if (!SUBSET (pspecs[n]->flags, class_pspec->flags, G_PARAM_READABLE | G_PARAM_WRITABLE))
{
g_critical ("Flags for property '%s' on class '%s' remove functionality compared with the "
"property on interface '%s'\n", pspecs[n]->name,
g_type_name (G_OBJECT_CLASS_TYPE (class)), g_type_name (iface_type));
continue;
}
/* If the property on the interface is writable then we need to
* make sure the implementation doesn't introduce new restrictions
* on that writability (ie: construct-only).
*
* If the interface was not writable to begin with then we don't
* really have any problems here because "writable at construct
* type only" is still more permissive than "read only".
*
* It's questionable if we should have G_PARAM_CONSTRUCT checked
* here....
*/
if (pspecs[n]->flags & G_PARAM_WRITABLE)
{
if (!SUBSET (class_pspec->flags, pspecs[n]->flags, G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY))
{
g_critical ("Flags for property '%s' on class '%s' introduce additional restrictions on "
"writability compared with the property on interface '%s'\n", pspecs[n]->name,
g_type_name (G_OBJECT_CLASS_TYPE (class)), g_type_name (iface_type));
continue;
}
}
#undef SUBSET
/* If the property on the interface is readable then we are /* If the property on the interface is readable then we are
* effectively advertising that reading the property will return a * effectively advertising that reading the property will return a
* value of a specific type. All implementations of the interface * value of a specific type. All implementations of the interface
@ -1432,26 +1482,6 @@ object_interface_check_properties (gpointer func_data,
default: default:
g_assert_not_reached (); g_assert_not_reached ();
} }
#define SUBSET(a,b,mask) (((a) & ~(b) & (mask)) == 0)
/* CONSTRUCT and CONSTRUCT_ONLY add restrictions to writability.
* READABLE and WRITABLE remove restrictions. The implementation
* paramspec must have less restrictive flags.
*/
if (pspecs[n]->flags & G_PARAM_WRITABLE)
{
if (!SUBSET (class_pspec->flags, pspecs[n]->flags, G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY))
g_critical ("Flags for property '%s' on class '%s' introduce additional restrictions on "
"writability compared with the property on interface '%s'\n", pspecs[n]->name,
g_type_name (G_OBJECT_CLASS_TYPE (class)), g_type_name (iface_type));
}
if (!SUBSET (pspecs[n]->flags, class_pspec->flags, G_PARAM_READABLE | G_PARAM_WRITABLE))
g_critical ("Flags for property '%s' on class '%s' remove functionality compared with the "
"property on interface '%s'\n", pspecs[n]->name,
g_type_name (G_OBJECT_CLASS_TYPE (class)), g_type_name (iface_type));
#undef SUBSET
} }
g_free (pspecs); g_free (pspecs);